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A2 conjunction #100 most common 13 min read

when

Top 100

Practice it Examples Notes & Tips when in 30 Seconds

Explanation when in your Level:

At the A1 level, 'when' is primarily introduced as a question word used to ask about time. Learners first encounter it in simple, direct questions like 'When is your birthday?' or 'When do you go to school?' At this stage, the focus is on understanding that 'when' seeks a temporal answer, such as a day, a date, or a time of day. Learners also begin to use 'when' as a basic conjunction to link two simple ideas, often related to daily routines. For example, 'I eat breakfast when I wake up.' The grammatical structure is kept simple, usually involving the present simple tense in both parts of the sentence. The goal for A1 learners is to recognize 'when' as a signal for time-related information and to use it to provide basic context for their actions. They learn that 'when' helps answer the fundamental question of 'at what time.' Exercises at this level often involve matching questions with appropriate time-based answers or completing simple sentences about their day. It is the first step in moving away from isolated words toward connected speech. Learners are encouraged to use 'when' to describe their habits and to ask basic information about others' schedules. This builds the foundation for more complex temporal relationships that will be introduced in later levels. By the end of A1, a student should feel comfortable using 'when' to ask about the timing of events and to make simple statements about when they perform common activities.

At the A2 level, the use of 'when' expands to include more varied sentence structures and a wider range of tenses. Learners begin to use 'when' to join two clauses more fluidly, often moving the 'when' clause to the beginning of the sentence for variety (e.g., 'When I am tired, I go to bed'). They also start using 'when' with the past simple to describe specific events in the past, such as 'When I was ten, I lived in London.' This allows them to provide historical context for their personal stories. A significant milestone at A2 is the introduction of the past continuous with 'when' to describe interruptions: 'I was walking home when it started to rain.' This structure is essential for narrative storytelling and helps learners describe scenes more vividly. Learners at this level also begin to understand the 'future time clause' rule, where 'when' is followed by the present simple even when referring to the future, although they may still make mistakes with this. The focus at A2 is on using 'when' to create more complex and descriptive sentences that go beyond simple facts. They are encouraged to use it to describe feelings, habits, and past experiences. Exercises might include transforming two simple sentences into one using 'when' or identifying the correct tense to use in an interruption scenario. By mastering 'when' at this level, learners can communicate more naturally and provide the necessary context for their listeners to follow their logic and timing.

At the B1 level, learners are expected to use 'when' with much greater accuracy and in more diverse contexts. The 'future time clause' rule (using present simple after 'when' for future events) should become more consistent. For example, 'I'll tell you the news when I see you' should be used without the common 'will' error. B1 learners also start to use 'when' in zero and first conditional sentences to express general truths and likely future outcomes. They begin to distinguish more clearly between 'when' (certainty) and 'if' (possibility), which is a key step in achieving intermediate proficiency. Furthermore, 'when' is used more frequently in professional and academic contexts to describe processes and sequences: 'When the chemical is added, the solution changes color.' Learners also explore the use of 'when' with the past perfect to show that one action was completed before another started: 'When I had finished the exam, I left the room.' This adds a layer of precision to their storytelling. At B1, the focus is on nuance and reliability. Learners should be able to use 'when' to structure longer pieces of writing and more detailed spoken explanations. They are also introduced to synonyms like 'as soon as' and 'whenever' to add variety to their language. Exercises at this level often involve choosing between 'when,' 'if,' 'while,' and 'since,' as well as practicing complex tense combinations. A B1 learner should be able to use 'when' to navigate most everyday and semi-formal situations with clarity and correct temporal sequencing.

At the B2 level, 'when' is used with a high degree of sophistication. Learners can use it to create complex narrative structures, often employing it alongside a variety of perfect and continuous tenses to show subtle relationships in time. For instance, 'When I had been waiting for an hour, I finally decided to leave.' This demonstrates a mastery of how 'when' can anchor multiple layers of time. B2 learners also use 'when' in more abstract and rhetorical ways. They might use it to introduce a point of contrast or to set a specific scene in an essay or presentation. The use of 'when' followed by a past participle or adjective (e.g., 'When asked about the incident, he refused to comment') becomes more common, reflecting a more formal and concise style of English. At this level, learners are also expected to understand the use of 'when' as a relative pronoun in phrases like 'the day when' or 'the time when,' which adds to their ability to define and describe specific moments. They can also use 'when' to express irony or to make generalizations about society or human behavior. The focus at B2 is on style, flow, and the ability to use 'when' to manage complex information. Learners are encouraged to experiment with the placement of 'when' clauses to achieve different stylistic effects. Exercises might involve rewriting formal reports to be more concise or analyzing the use of 'when' in literature and news media. A B2 learner should be able to use 'when' as a versatile tool for both precise description and creative expression.

At the C1 level, the use of 'when' is nearly effortless and highly nuanced. Learners can use it to handle very complex temporal shifts and to express subtle logical connections. They are comfortable with 'when' in all its grammatical forms, including its use in reduced clauses and as a relative pronoun. At this stage, 'when' is often used to introduce hypothetical or counterfactual situations in advanced conditional structures. For example, 'When one considers the historical context, the decision becomes more understandable.' Here, 'when' functions almost as a formal 'if' or 'given that,' showing a high level of academic proficiency. C1 learners also use 'when' to manage the rhythm of their speech and writing, using it to create suspense, emphasis, or a sense of inevitability. They are sensitive to the different registers in which 'when' operates and can choose between it and its more formal or informal alternatives with ease. They also understand the use of 'when' in idiomatic expressions and can use them naturally in conversation. The focus at C1 is on total control and the ability to use 'when' to convey complex, multi-layered meanings. Learners are expected to produce long, coherent texts where 'when' serves as a key organizational tool. Exercises might include analyzing the rhetorical function of 'when' in famous speeches or using it to structure a persuasive argument. A C1 learner uses 'when' not just as a time marker, but as a sophisticated instrument for logical and narrative architecture.

At the C2 level, the learner's use of 'when' is indistinguishable from that of a highly articulate native speaker. They can use the word with absolute precision in any context, from technical scientific writing to evocative poetry. At this level, 'when' is often used in very subtle ways to imply causality, irony, or a specific philosophical perspective. For example, 'When all is said and done' or 'When the dust settles' are used with a deep understanding of their metaphorical weight. C2 learners can also use 'when' to create complex, nested temporal structures that are perfectly clear and grammatically flawless. They are masters of the reduced 'when' clause and can use it to achieve a very high level of density and elegance in their writing. Furthermore, they can appreciate and use 'when' in its most archaic or literary forms if the context requires it. The focus at C2 is on mastery of register, tone, and the most subtle nuances of meaning. A C2 learner can use 'when' to navigate the most challenging communicative tasks, such as negotiating complex contracts, delivering academic lectures, or writing professional fiction. They understand how 'when' interacts with every other part of the English language and can use it to achieve exactly the effect they desire. At this level, 'when' is no longer a word to be studied, but a flexible and powerful tool for the highest levels of human communication. Exercises at this level might involve translating complex philosophical texts or writing in a variety of highly specialized styles where 'when' plays a crucial role in the structure and meaning.

Practice it Examples Notes & Tips

when in 30 Seconds

A versatile conjunction used to link events in time, whether past, present, or future.
Functions as a question word to inquire about specific dates, times, or periods.
Requires the present simple tense when referring to future events in the subordinate clause.
Essential for storytelling, giving instructions, and describing habits or general truths.

The word when is one of the most fundamental temporal anchors in the English language. At its core, it functions as a bridge between two events, establishing a chronological relationship that helps the listener or reader understand the sequence of life. When we use this word, we are essentially setting a stage or pointing to a specific coordinate in the vast dimension of time. It is not merely a question word; it is a connective tissue that allows us to narrate our lives, explain cause and effect, and describe habitual actions. In everyday conversation, people use 'when' to provide context. Without it, our sentences would be fragmented and disconnected. Imagine trying to tell a story about your childhood without being able to say 'when I was young.' The word provides the necessary 'time stamp' for our thoughts. It acts as a subordinating conjunction, which means it introduces a clause that cannot stand alone but adds vital information to the main part of the sentence. This relationship is crucial for building complex thoughts and moving beyond the simple, isolated sentences of a beginner learner. We use it to describe single completed actions in the past, ongoing situations that were interrupted, and even future plans that are contingent on a specific moment arriving. It is a versatile tool that adapts to the tense of the sentence, whether we are looking back at history, discussing the present moment, or peering into the future. Furthermore, 'when' carries a sense of certainty that distinguishes it from words like 'if.' While 'if' introduces a possibility, 'when' introduces an expectation of occurrence. This nuance is vital for effective communication, as it signals to the listener whether the speaker is certain about the timing or the event itself. In professional settings, 'when' is used to define deadlines and project milestones, while in creative writing, it serves as a rhythmic device to build suspense or establish atmosphere. It is the heartbeat of narrative structure, ensuring that the 'what' of a story is always grounded in the 'when.'

Temporal Function: The primary role of 'when' is to indicate the time at which something happens. It can refer to a specific point in time or a general period.

Conditional Aspect: In certain contexts, 'when' functions similarly to 'whenever,' describing a recurring situation where one action consistently follows another.

Narrative Link: It serves as a transition between different parts of a story, allowing the narrator to jump between different timeframes smoothly.

I will call you when I arrive at the station.

When the sun goes down, the temperature drops quickly.

He was sleeping when the phone rang.

Tell me when you are ready to leave.

When in doubt, ask for help.

Mastering the use of when requires an understanding of sentence structure and tense harmony. As a conjunction, 'when' joins two clauses: the main clause and the 'when' clause (subordinate clause). The placement of these clauses can change the rhythm and emphasis of your sentence without necessarily changing the meaning. For example, you can say 'I was happy when I saw her' or 'When I saw her, I was happy.' Notice that in the second example, a comma is required to separate the clauses. This flexibility allows speakers to emphasize either the action or the timing. One of the most critical rules to remember involves future time. In English, we do not use 'will' inside the 'when' clause if we are talking about the future. Instead, we use the present simple. For instance, 'When I finish my work, I will go home' is correct, while 'When I will finish' is a common error. This rule applies to other time conjunctions like 'before' and 'after' as well. Furthermore, 'when' is frequently used with the past continuous to show that one action was in progress when another shorter action happened. 'I was eating dinner when the doorbell rang' illustrates this perfectly. The longer action (eating) is interrupted by the shorter action (the bell ringing). In this context, 'when' acts as the trigger for the interruption. Additionally, 'when' can be used to describe general truths or habits. 'When it rains, the ground gets wet' is a zero conditional sentence where 'when' means 'every time.' This usage is common in scientific descriptions or when explaining rules. In more advanced usage, 'when' can be followed by a past participle or an adjective, omitting the subject and the verb 'to be' for brevity. For example, 'When finished, please turn off the lights' instead of 'When you have finished...' This condensed form is often found in instructions and formal writing. Understanding these patterns allows a learner to move from simple sentences to more sophisticated, fluid communication. It is also important to distinguish 'when' from 'while.' While 'when' usually refers to a specific point or a sequence, 'while' emphasizes the duration of two simultaneous actions. 'I listened to music while I was running' suggests the two happened together throughout the period. 'I started running when the music started' suggests a sequence. By paying attention to these subtle differences, you can provide much clearer descriptions of events and their relationships to one another in time.

The Future Rule: Always use the present tense in a 'when' clause that refers to a future event. The main clause still uses the future tense.

The Comma Rule: Use a comma after the 'when' clause if it starts the sentence. No comma is needed if the 'when' clause follows the main clause.

The Interruption Pattern: Combine the past continuous (was/were -ing) with the past simple to show an action being interrupted by another event.

When you see the sign, turn left.

She was a student when she wrote her first book.

When I grow up, I want to be a pilot.

In the real world, when is ubiquitous. You will hear it in every possible context, from the most casual conversations to the most formal legal proceedings. In daily life, it is the cornerstone of scheduling. 'When are we meeting?' or 'When is the bus coming?' are phrases you might hear or say multiple times a day. In the workplace, 'when' is used to establish deadlines and project timelines. A manager might say, 'When you finish the report, please send it to the team.' Here, 'when' is polite but firm, setting a clear expectation of what happens next. In news reporting, 'when' is one of the five 'W's (Who, What, Where, When, Why) that journalists must answer to provide a complete story. You will hear news anchors say things like, 'The incident occurred when the driver lost control of the vehicle.' This usage provides the necessary temporal context for the audience to understand the event. In movies and literature, 'when' is used to create dramatic shifts. Think of the classic line, 'When the clock strikes midnight...' It signals a change in the narrative, a moment of transformation or climax. In music, 'when' is a favorite for songwriters because it naturally introduces emotional reflections. Songs like 'When I Was Your Man' or 'When We Were Young' use the word to look back at the past with nostalgia or regret. It anchors the listener in a specific emotional memory. Even in technology, 'when' is a fundamental concept. In programming, 'when' (or 'if/then' logic) is used to tell a computer what to do at a specific moment or under a specific condition. For example, 'When the user clicks the button, show the menu.' This logical structure mirrors how we use the word in human language. In social media, you see it in memes and captions, often starting with 'That moment when...' to describe a relatable situation. This has become a cultural shorthand for shared experiences. Whether you are listening to a podcast, watching a documentary, or just chatting with a friend at a coffee shop, 'when' is the word that connects the dots of time and experience. It is so common that we often don't notice it, but its absence would make communication nearly impossible. It is the invisible thread that holds our chronological understanding of the world together. By paying attention to how native speakers use 'when' in different environments, you can pick up on subtle cues about formality, certainty, and emotional tone. It is not just a word; it is a fundamental building block of human expression.

Call me when you get a chance.

When the going gets tough, the tough get going.

Even though when is a common word, it presents several pitfalls for English learners. The most frequent mistake is using 'will' in the 'when' clause to talk about the future. Many learners say, 'When I will arrive, I will call you.' In English, the 'when' clause already implies a future timeframe because of the context of the main clause, so the present simple is used instead: 'When I arrive, I will call you.' This is a rule that requires constant practice until it becomes instinctive. Another common error is confusing 'when' with 'if.' While they can sometimes be interchangeable in general statements (e.g., 'When/If it rains, the grass grows'), they have distinct meanings in specific situations. 'When' implies certainty—you know the event will happen, you just don't know exactly when. 'If' implies uncertainty—the event might not happen at all. For example, 'When I get home' suggests you are definitely going home. 'If I get home' suggests there is a possibility you might not. Using the wrong one can lead to confusion about your intentions or expectations. A third mistake involves the use of 'when' vs. 'while.' As mentioned before, 'when' is better for single actions or sequences, while 'while' is for duration. Saying 'When I was watching TV, the phone rang' is correct, but saying 'When I was watching TV, I was eating' is less natural than using 'while.' Furthermore, learners often forget the comma when the 'when' clause starts the sentence. While this is a punctuation error rather than a spoken one, it is important for clear writing. Another subtle mistake is using 'when' when 'since' is more appropriate. 'When' refers to a point in time, while 'since' refers to the duration from that point until now. 'I have lived here when I was a child' is incorrect; it should be 'I have lived here since I was a child.' Finally, some learners use 'when' as a relative pronoun for places or things, which is incorrect. You should use 'where' for places and 'which' or 'that' for things. 'The house when I lived' should be 'The house where I lived.' By being mindful of these common errors, you can significantly improve the accuracy and naturalness of your English. It is helpful to record yourself speaking and listen specifically for how you handle future time clauses and the distinction between 'when' and 'if.' Over time, these corrections will become second nature, and your speech will flow more smoothly.

The 'Will' Trap: Avoid: 'When I will see him...' Correct: 'When I see him...'

When vs. If: Use 'when' for things that are certain to happen. Use 'if' for things that might happen.

Incorrect: I will tell her when I will see her.

Correct: I will tell her when I see her.

To expand your vocabulary beyond when, it is useful to explore words that offer more specific temporal meanings. 'While' is the most common alternative, used when two actions are happening at the same time. It emphasizes the duration rather than the start or end point. 'As soon as' is a powerful alternative when you want to emphasize that one action happens immediately after another. 'I will call you when I arrive' is neutral, but 'I will call you as soon as I arrive' adds a sense of urgency or promptness. 'Whenever' is used when the specific time doesn't matter or when an action happens every time a condition is met. 'Whenever I see that movie, I cry' suggests a repeated, habitual occurrence. 'Once' is often used in a similar way to 'as soon as' but can also imply a sense of completion. 'Once you finish your dinner, you can have dessert.' This sounds a bit more formal or decisive than 'when.' In more formal or literary contexts, you might see 'at which time' or 'whereupon.' For example, 'He finished his speech, whereupon the audience cheered.' This is much more formal than 'When he finished his speech, the audience cheered.' Another related word is 'since,' which, as mentioned, focuses on the period of time starting from a specific point. 'I haven't seen him since we graduated.' Understanding these alternatives allows you to be more precise in your descriptions. For instance, if you want to describe a background action, 'as' is often a good choice: 'As I was walking down the street, I saw an old friend.' This is very similar to 'when' or 'while' but often feels more descriptive of the scene. By choosing the right word, you can control the pace and focus of your sentences. 'When' is the reliable, all-purpose choice, but these alternatives provide the shades of meaning that make your English sound more advanced and nuanced. Practice replacing 'when' in your sentences with these alternatives to see how the meaning or tone changes. You'll find that 'as soon as' makes you sound more efficient, 'whenever' makes you sound more flexible, and 'once' makes you sound more focused on completion.

As soon as: Emphasizes immediacy. Use this when one thing happens right after another.

Whenever: Use for repeated actions or when the exact time is not important.

While: Use to emphasize that two actions are happening simultaneously over a period of time.

I'll leave as soon as the meeting ends.

You can visit whenever you like.

How Formal Is It?

Fun Fact

In Old English, 'when' was often used in a way that combined both 'when' and 'if', reflecting how closely these concepts are linked in human logic.

Pronunciation Guide

UK /wen/

US /wɛn/

Typically unstressed in a sentence unless it is being emphasized for contrast.

Rhymes With

then pen ten men hen den zen again (sometimes)

Common Errors

Pronouncing the 'h' too strongly (like 'hwen').
Confusing the vowel sound with 'wan' or 'win'.
Failing to link it to the following word in natural speech.
Using a long 'e' sound.
Mumbling the word so it sounds like 'then'.

Difficulty Rating

Reading 1/5

Very easy to recognize in text.

Writing 3/5

Challenging due to the future tense rule and comma usage.

Speaking 2/5

Natural to use, but requires practice with interruptions.

Listening 1/5

Usually clear, though can be linked to other words.

What to Learn Next

Prerequisites

time day clock before after

Learn Next

while whenever as soon as since until

Advanced

whereupon at which point simultaneously subsequently consequently

Grammar to Know

Future Time Clauses

When I *arrive* (not will arrive), I will call you.

Past Continuous Interruption

I was *reading* when the lights *went* out.

Zero Conditional

When you heat ice, it melts.

Relative Clauses of Time

That was the year when everything changed.

Reduced Adverbial Clauses

When *opening* the box, be careful.

Examples by Level

When is the party?

Asking about the time of an event.

Interrogative use of 'when' to ask a question.

I drink water when I am thirsty.

A simple habit or reaction.

Using 'when' to connect a condition and an action.

When do you go to bed?

Asking about a daily routine.

Question form with 'do' for daily habits.

It is cold when it snows.

Describing a general fact.

Zero conditional structure for general truths.

When I see my dog, I am happy.

Expressing a feeling related to an event.

Comma used after the 'when' clause at the start.

Tell me when you are ready.

Asking for information about timing.

Imperative followed by a 'when' clause.

When is your English class?

Asking for a specific schedule.

Simple question about a scheduled time.

I wear a coat when it is winter.

A routine based on the season.

Present simple used for habitual actions.

When I was a child, I liked chocolate.

Talking about the past.

Using 'when' with the past simple for past states.

I was sleeping when you called me.

An interrupted action in the past.

Past continuous + when + past simple.

When I finish my homework, I will play games.

A future plan.

Present simple in the 'when' clause for future meaning.

She felt nervous when she started the job.

Describing an emotion at a specific time.

Past simple in both clauses for a completed event.

When the movie ended, we went home.

A sequence of events in the past.

Comma used after the initial 'when' clause.

I will buy a car when I have enough money.

A condition for a future action.

Present simple 'have' used for the future condition.

When it rains, I usually stay at home.

A habitual action.

Adverb of frequency 'usually' used with 'when'.

He was driving when he saw the accident.

A background action and a sudden event.

Classic interruption pattern with 'when'.

I'll call you when I get to the airport.

A common future arrangement.

Strict adherence to present simple for future 'when' clause.

When you have finished the report, please send it.

A professional instruction.

Present perfect in 'when' clause to emphasize completion.

I had already left when he arrived.

Sequence of two past actions.

Past perfect used to show the first action.

When I'm traveling, I love to try local food.

Describing a habit during a period.

Present continuous in 'when' clause for ongoing habits.

Tell me when you're ready to order.

A waiter speaking to a customer.

Indirect question structure with 'when'.

When the sun comes out, we can go for a walk.

A plan dependent on the weather.

First conditional style using 'when' instead of 'if'.

I was very surprised when I heard the news.

Reaction to an event.

Past simple for both the event and the reaction.

When I was living in Paris, I visited the Louvre.

A specific event during a past period.

Past continuous in 'when' clause for the time period.

When confronted with the evidence, he confessed.

A formal, concise description.

Reduced 'when' clause with a past participle.

I'll let you know when the results are available.

A formal promise of information.

Passive voice used within the 'when' clause.

When I had been working there for five years, I got a promotion.

A long-term past duration.

Past perfect continuous with 'when'.

There are times when I wonder if I made the right choice.

Reflecting on life and decisions.

'When' used as a relative pronoun for 'times'.

When in Rome, do as the Romans do.

A famous proverb about adaptation.

Reduced 'when' clause with a prepositional phrase.

He only calls me when he needs something.

A slightly negative observation of a habit.

Using 'only' to limit the 'when' condition.

When the economy improves, interest rates will rise.

A formal economic prediction.

Formal use of 'when' for predictable outcomes.

I was just about to leave when the phone rang.

A very specific moment of interruption.

'Just about to' + 'when' for immediate sequence.

When one considers the scale of the problem, the solution seems inadequate.

A formal academic observation.

Generic 'one' used in a formal 'when' clause.

The project was doomed from the moment when the funding was cut.

Identifying a critical turning point.

'When' as a relative pronoun modifying 'the moment'.

When asked to explain his actions, he remained silent.

A concise, formal narrative style.

Reduced 'when' clause common in journalism.

I'll be happy when this whole ordeal is finally over.

Expressing relief about a future end.

Using 'when' to express a strong desire for a future state.

When the history of this era is written, this day will be remembered.

A dramatic, rhetorical statement.

Passive voice in 'when' clause for formal effect.

It's hard to know when to stop when you're on a roll.

A common idiom about momentum.

Using 'when' + infinitive ('when to stop').

When faced with such a challenge, we must unite.

A call to action in a speech.

Reduced 'when' clause for rhetorical power.

I remember a time when things were much simpler.

Nostalgic reflection on the past.

Relative 'when' clause modifying 'a time'.

When all is said and done, it was a risk worth taking.

Summarizing a complex situation.

Idiomatic use of 'when' in a fixed expression.

When the dust has settled, we will be able to assess the damage.

Waiting for a situation to become clear.

Metaphorical use of 'when' for clarity.

The true test of character is how one behaves when no one is watching.

A philosophical observation.

Using 'when' to define a moral condition.

When viewed through the lens of modern theory, the text takes on new meaning.

Highly formal literary analysis.

Advanced reduced clause with metaphorical 'lens'.

I was just drifting off to sleep when a sudden thought struck me.

Describing a sudden mental event.

Precise use of 'when' for a sudden epiphany.

When the opportunity arose, she seized it without hesitation.

Describing a decisive action.

Formal vocabulary ('arose', 'seized') with 'when'.

When it comes to politics, everyone has an opinion.

Introducing a specific topic.

Fixed expression 'when it comes to'.

Only when the last tree has died will we realize we cannot eat money.

A powerful environmental warning.

Inversion ('will we realize') after 'only when'.

Common Collocations

when it comes to

back when

just when

even when

only when

tell me when

when possible

when necessary

since when

when in doubt

Common Phrases

When on earth...?

— Used to add emphasis or surprise to a question about time.

When on earth did you find the time to do that?

When all is said and done

— Used to summarize the most important point after considering everything.

When all is said and done, the most important thing is family.

When the time is right

— At a suitable or appropriate moment in the future.

We will tell them the news when the time is right.

When push comes to shove

— When a situation becomes critical or a decision must be made.

When push comes to shove, he always helps his friends.

When you get a chance

— A polite way to ask someone to do something when they are free.

Please call me back when you get a chance.

When least expected

— Happening at a time when you are not prepared for it.

Success often comes when least expected.

When the going gets tough

— When a situation becomes difficult or challenging.

When the going gets tough, the tough get going.

When in Rome

— Short for 'When in Rome, do as the Romans do' - follow local customs.

I don't usually eat snails, but when in Rome!

When you put it like that

— Used when someone's explanation makes you see things differently.

When you put it like that, I guess you're right.

When the day comes

— Referring to a specific, expected future event.

When the day comes, I'll be ready for the challenge.

Often Confused With

when vs if

'When' is for certain events; 'if' is for possible events.

when vs while

'When' is for points or sequences; 'while' is for duration.

when vs since

'When' is a point in time; 'since' is the time from that point until now.

Idioms & Expressions

"When pigs fly"

— Something that will never happen.

I'll clean my room when pigs fly!

informal

"When the cat's away, the mice will play"

— People misbehave when their supervisor or authority figure is absent.

The students were loud because the teacher was gone; when the cat's away, the mice will play.

neutral

"When one door closes, another opens"

— When you lose one opportunity, a new one will appear.

Don't be sad about the job; when one door closes, another opens.

neutral

"When in doubt, leave it out"

— If you are unsure about something, it is better not to include it.

I wasn't sure if the joke was funny, so I followed the rule: when in doubt, leave it out.

neutral

"When it rains, it pours"

— When one bad thing happens, many other bad things happen at the same time.

First I lost my keys, then my car broke down; when it rains, it pours.

informal

"When the chips are down"

— In a difficult or dangerous situation where you must be brave or decisive.

You find out who your real friends are when the chips are down.

informal

"When the dust settles"

— When a situation becomes calm or clear after a period of excitement or confusion.

We will make a decision when the dust settles.

neutral

"When hell freezes over"

— Another way to say 'never'.

I'll go on a date with him when hell freezes over!

informal/slang

"When all's said and done"

— After everything has been considered or finished.

When all's said and done, it was a great experience.

neutral

"When the cows come home"

— For a very long time, or forever.

You can talk until the cows come home, but I won't change my mind.

informal

Easily Confused

when vs Whenever

They both relate to time.

'When' refers to a specific time, while 'whenever' refers to any time or every time.

I'll call you when I'm ready. (Specific) vs. Call me whenever you want. (Any time)

when vs Where

Both are 'W' question words.

'When' is for time; 'where' is for place.

When is the meeting? vs. Where is the meeting?

when vs Whether

Similar sound.

'When' is about time; 'whether' is about a choice between two options.

Tell me when you go. vs. Tell me whether you are going or not.

when vs While

Both connect simultaneous events.

'While' emphasizes that two things are happening at the same time for a period.

I read while I wait.

when vs Then

They are often used together.

'When' introduces the time; 'then' introduces the next action.

When it stops raining, then we can go.

Sentence Patterns

When is [Event]?

When is lunch?

I [Verb] when I [Verb].

I smile when I am happy.

When I was [Age/Time], I [Verb-ed].

When I was young, I lived in Spain.

I was [Verb-ing] when [Verb-ed].

I was eating when he arrived.

I will [Verb] when I [Verb-Present].

I will tell you when I know.

When [Past Participle], [Main Clause].

When finished, please leave.

Only when [Clause] [Inversion].

Only when it's too late do we realize.

When all is said and done, [Main Clause].

When all is said and done, we did our best.

Word Family

whenever

whence

where

why

while

How to Use It

frequency

Extremely high; one of the top 50 most common words in English.

Common Mistakes

When I will go to the store, I will buy milk. → When I go to the store, I will buy milk.
You cannot use 'will' in a time clause starting with 'when' to refer to the future. Use the present simple instead.
I have been waiting when 2 o'clock. → I have been waiting since 2 o'clock.
Use 'since' to show the starting point of a duration. 'When' is used for a point in time, but not with 'have been'.
When I was watching TV I heard a noise. → When I was watching TV, I heard a noise.
A comma is required when the 'when' clause begins the sentence.
The restaurant when we ate was good. → The restaurant where we ate was good.
'When' is for time, 'where' is for places. Do not use 'when' to describe a location.
I'll call you if I get home. → I'll call you when I get home.
If you are certain you are going home, use 'when'. 'If' suggests you might not go home at all.

Tips

The Present for Future Rule

Always remember to use the present simple after 'when' when you are talking about the future. This is one of the most common mistakes for learners. Think: 'When I arrive...' instead of 'When I will arrive...'

The Comma Check

If your sentence starts with 'When', put a comma after that first part. It helps the reader know where the main action starts. 'When the sun sets, the stars appear.'

Use 'As Soon As' for Urgency

If you want to sound more immediate or urgent, replace 'when' with 'as soon as'. It shows that the second action happens right away.

Natural Linking

In natural speech, 'when' often blends into the next word. Practice saying 'When-I', 'When-it', and 'When-you' as single sounds to sound more like a native speaker.

Identify the Interruption

When you hear 'when' followed by a past simple verb, look for a past continuous verb nearby. This will help you identify which action was interrupted.

Vary Your Sentences

Don't always put 'when' in the middle of the sentence. Try starting with it sometimes to change the rhythm of your writing.

When vs. If

Before you speak, ask yourself: Is this certain? If yes, use 'when'. If it's just a possibility, use 'if'.

Learn 'When in Doubt'

This is a very useful phrase. You can use it in many situations: 'When in doubt, ask a teacher' or 'When in doubt, keep it simple.'

Look for the Time Stamp

When reading, use the word 'when' as a marker to help you understand the timeline of the story or article.

Daily Routine Practice

Every morning, say three things you will do using 'when'. For example: 'When I finish breakfast, I will brush my teeth.'

Memorize It

Mnemonic

Think of the 'W' in 'When' as a 'Watch'—it always asks about the time.

Visual Association

Imagine a big clock with the word 'WHEN' written across the face. Every time you see a clock, think of the word.

Word Web

Time Clock Schedule Moment Sequence Past Future Interruption

Challenge

Try to write five sentences about your day, each starting with the word 'When'.

Word Origin

The word 'when' comes from the Old English word 'hwanne' or 'hwænne'. It has roots in the Proto-Germanic 'hwan', which is related to the interrogative base 'hwa-' (who). It has been a part of the English language since its earliest forms, consistently serving as a marker of time.

Original meaning: At what time; under what circumstances.

Germanic

Cultural Context

Be careful when using 'when' to ask about sensitive future events (like 'When are you getting married?') as it can be seen as intrusive.

Punctuality is key; 'when' is used precisely for meetings and social gatherings.

The song 'When Doves Cry' by Prince. The movie 'When Harry Met Sally'. The poem 'When You Are Old' by W.B. Yeats.

Practice in Real Life

Real-World Contexts

Travel

When is the next train?
When do we arrive?
When should I check in?
When does the museum open?

Work

When is the deadline?
When can we meet?
When will the report be ready?
When did you send the email?

Social

When are you free?
When is your birthday?
When did you last see him?
When shall we go out?

Cooking

When the water boils, add salt.
When the cake is brown, take it out.
When should I turn off the oven?
When do I add the sugar?

Daily Routine

When I wake up, I drink coffee.
When do you go to sleep?
When is dinner?
When do you finish work?

Conversation Starters

"When was the last time you went on a long vacation?"

"When did you first realize you wanted to learn English?"

"When you have free time, what is your favorite thing to do?"

"When is the best time of year to visit your home country?"

"When you were a child, what did you want to be when you grew up?"

Journal Prompts

Write about a time when you felt incredibly proud of yourself.

Describe what you do when you feel stressed or overwhelmed.

When you look back at the last year, what is your favorite memory?

Think about your future. When you achieve your goals, how will your life change?

Describe a moment when you learned a very important life lesson.

Frequently Asked Questions

10 questions

Generally, no. When referring to the future in a 'when' clause, you should use the present simple tense. For example, 'When I see him' is correct, not 'When I will see him'. The only exception is when 'when' is used as a question word in an indirect question, like 'I don't know when he will arrive'.

You need a comma if the 'when' clause comes at the beginning of the sentence. For example: 'When it rains, I stay inside.' If the 'when' clause comes at the end, you don't need a comma: 'I stay inside when it rains.'

'When' usually refers to a specific point in time or a sequence of events. 'While' is used to emphasize that two actions are happening at the same time over a period. For example, 'When the phone rang, I answered it' (sequence) vs. 'While I was cooking, I was listening to music' (simultaneous duration).

In some cases, yes, specifically in 'zero conditional' sentences that describe general truths. 'When you heat water, it boils' and 'If you heat water, it boils' mean the same thing. However, for specific future events, 'when' implies certainty and 'if' implies possibility.

Not exactly. 'Whenever' means 'at any time' or 'every time'. It is more general than 'when'. 'When I see him, I'll tell him' (one specific time) vs. 'Whenever I see him, he's happy' (every time).

You can use 'when' with the past simple to show a sequence ('When he arrived, we ate') or with the past continuous to show an interruption ('When he arrived, I was eating').

Rarely, but yes. It can refer to the time of an event. For example, 'We need to decide on the where and the when of the meeting'.

'Since when' is used to express surprise or doubt about a new habit or situation. For example, 'Since when do you drink green tea?' implies that the person didn't use to drink it.

Yes, absolutely! It is a very common way to start a sentence to provide context. Just remember the comma after the clause.

'When' is neutral and can be used in any context, from a chat with a friend to a formal academic paper.