hour
hour in 30 Seconds
- An hour is a standard unit of time consisting of 60 minutes, used globally for scheduling and measuring duration.
- Grammatically, 'hour' is a countable noun that requires the article 'an' because the initial 'h' is silent.
- The concept of the 24-hour day originated from ancient civilizations and is essential for modern social and professional organization.
- Beyond literal time, 'hour' appears in many idioms like 'eleventh hour' or 'man of the hour' to describe significant moments.
- Temporal Measurement
- An hour represents one twenty-fourth of a solar day, providing a standardized rhythm to human activity across the globe.
The flight to Paris takes exactly one hour from London Heathrow.
- Daily Routine
- Lunch hours, office hours, and happy hours are all culturally significant periods defined by this unit.
I will finish the report in half an hour.
The doctor's visiting hours are from nine to five.
We spent an hour walking through the park.
The shop closes in one hour.
- Metaphorical Use
- Sometimes an 'hour' refers to a specific significant time, like 'man of the hour' or 'darkest hour'.
- Prepositional Usage
- We use 'in' to indicate a future point (in an hour), 'for' to indicate duration (for an hour), and 'at' for specific clock times (at four o'clock).
She works eight hours a day, five days a week.
- Quantifiers
- Use 'half an hour', 'quarter of an hour', or 'a couple of hours' to specify durations less than or slightly more than sixty minutes.
I've been waiting for you for over an hour!
The movie was three hours long, which felt a bit excessive.
Could you give me an hour to finish this task?
The hour hand on the clock is shorter than the minute hand.
- Frequency
- To describe how often something happens, use 'per hour' or 'every hour'. For example, 'The speed limit is sixty miles per hour'.
- Professional Contexts
- Lawyers and consultants often talk about 'billable hours', while retail workers discuss their 'shift hours'.
Traffic is always terrible during rush hour in the city center.
- Social Contexts
- Friends might say, 'Let's grab a coffee for an hour,' or 'I'll be there in half an hour.'
The radio station plays the latest hits every hour.
We have a one-hour lunch break starting at noon.
The museum's opening hours are posted on the front door.
I can't believe it's already the lunch hour!
- Technical Contexts
- In science and engineering, 'kilowatt-hour' (kWh) is a common unit of energy consumption found on electricity bills.
- Article Errors
- Incorrect: 'I will be there in a hour.' Correct: 'I will be there in an hour.'
Incorrect: We waited for two o'clock. Correct: We waited for two hours.
- Pluralization in Compounds
- When used as an adjective, 'hour' should not be plural. Incorrect: 'A two-hours movie'. Correct: 'A two-hour movie'.
The hour was long. (Singular verb for singular noun)
The hours were long. (Plural verb for plural noun)
I'll see you in half an hour. (Not 'half hour' or 'a half hour' - though 'a half hour' is occasionally heard, 'half an hour' is more standard).
It's a one-hour drive. (Correct compound adjective use).
- Misusing 'Per Hour'
- In casual conversation, we often say 'an hour' instead of 'per hour'. For example, 'I earn twenty dollars an hour'. Using 'per' is more formal.
- Duration vs. Moment
- 'Hour' describes a specific length of time, whereas 'moment' or 'instant' describes a very brief, almost immeasurable point in time.
The hour is almost up; please finish your work.
- Comparing Units
- 1 Hour = 60 Minutes. 1 Day = 24 Hours. 1 Week = 168 Hours.
We have a window of one hour to complete the transfer.
The period between 2 PM and 3 PM is my most productive hour.
Each session lasts for exactly one hour.
The timeframe for the project is tight.
- Specialized Terms
- 'Lesson' or 'period' is used in schools. 'Slot' is used for appointments. 'Stint' refers to a period of work.
How Formal Is It?
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Fun Fact
The division of the day into 24 hours comes from the ancient Egyptians, who divided the day into 10 hours of daylight, 2 hours of twilight, and 12 hours of darkness.
Pronunciation Guide
- Pronouncing the 'h' (it should be silent).
- Confusing the sound with 'hire'.
- Making it sound like 'how-er'.
- Over-emphasizing the 'r' in non-rhotic accents.
- Failing to use the 'an' article which follows the vowel sound.
Difficulty Rating
Very easy to recognize in text as a common time unit.
Easy, but learners must remember the 'an' article and the silent 'h'.
The silent 'h' and homophone 'our' can be tricky for beginners.
Can be confused with 'our' in fast, natural speech.
What to Learn Next
Prerequisites
Learn Next
Advanced
Grammar to Know
Silent H Article Rule
Use 'an' before 'hour' because it starts with a vowel sound.
Compound Adjective Rule
In 'a two-hour movie', 'hour' is singular because it acts as an adjective.
Prepositions of Duration
Use 'for' to describe how long an action lasts: 'I waited for an hour'.
Prepositions of Future Time
Use 'in' to say when something will happen: 'I'll see you in an hour'.
Pluralization
Add 's' for any number of hours greater than one: 'three hours'.
Examples by Level
I study English for one hour every day.
I study English for one hour every day.
Use 'for' to show duration.
The movie is two hours long.
The movie is two hours long.
Plural 'hours' for numbers greater than one.
I will meet you in an hour.
I will meet you in an hour.
Use 'an' because the 'h' is silent.
There are twenty-four hours in a day.
There are twenty-four hours in a day.
Fact-based sentence using plural 'hours'.
The shop opens in half an hour.
The shop opens in half an hour.
'Half an hour' means 30 minutes.
We walk for one hour in the park.
We walk for one hour in the park.
Simple present tense for routine.
Wait for one hour, please.
Wait for one hour, please.
Imperative sentence with duration.
The bus comes every hour.
The bus comes every hour.
'Every hour' shows frequency.
The flight takes about four hours.
The flight takes about four hours.
'About' expresses an approximate duration.
I spent two hours doing my homework.
I spent two hours doing my homework.
'Spent [time] doing' is a common pattern.
What are the museum's opening hours?
What are the museum's opening hours?
'Opening hours' is a fixed compound noun.
It’s a three-hour drive to the beach.
It’s a three-hour drive to the beach.
'Three-hour' is a compound adjective; it remains singular.
I'll be back in a quarter of an hour.
I'll be back in a quarter of an hour.
'Quarter of an hour' equals 15 minutes.
The doctor has office hours on Tuesday.
The doctor has office hours on Tuesday.
'Office hours' refers to availability.
We were stuck in traffic for an hour.
We were stuck in traffic for an hour.
Past tense 'were' with duration.
She works thirty-five hours a week.
She works thirty-five hours a week.
'[Number] hours a week' shows work frequency.
The speed limit is sixty miles per hour.
The speed limit is sixty miles per hour.
'Per hour' is used for rates of speed.
I need to bill the client for ten hours of work.
I need to bill the client for ten hours of work.
'Bill for [time]' is a professional phrase.
The city is very crowded during rush hour.
The city is very crowded during rush hour.
'Rush hour' refers to peak traffic periods.
He called me at all hours of the night.
He called me at all hours of the night.
'At all hours' means very frequently or at inappropriate times.
We should leave now to avoid the peak hour.
We should leave now to avoid the peak hour.
'Peak hour' is synonymous with rush hour.
The power was out for several hours.
The power was out for several hours.
'Several hours' indicates an indefinite plural amount.
They spent the small hours of the morning talking.
They spent the small hours of the morning talking.
'Small hours' refers to the time just after midnight.
The battery provides three hours of continuous use.
The battery provides three hours of continuous use.
'[Time] of [activity]' describes duration.
The deal was signed at the eleventh hour.
The deal was signed at the eleventh hour.
Idiom meaning 'at the very last moment'.
He is truly the man of the hour after his heroic act.
He is truly the man of the hour after his heroic act.
Idiom meaning 'the person most noticed or praised'.
The project required hundreds of man-hours to complete.
The project required hundreds of man-hours to complete.
'Man-hours' measures the total work done by people.
In his darkest hour, he found the strength to continue.
In his darkest hour, he found the strength to continue.
Metaphorical use meaning 'the most difficult time'.
The restaurant offers a discount during happy hour.
The restaurant offers a discount during happy hour.
'Happy hour' is a cultural social term.
The satellite orbits the Earth once every hour and a half.
The satellite orbits the Earth once every hour and a half.
'Hour and a half' is a common way to say 90 minutes.
The speaker held the audience's attention for the entire hour.
The speaker held the audience's attention for the entire hour.
'Entire hour' emphasizes the full duration.
She was paid by the hour for her freelance consulting.
She was paid by the hour for her freelance consulting.
'Paid by the hour' describes the payment structure.
The legislation was passed after hours of heated debate.
The legislation was passed after hours of heated debate.
Plural 'hours' used for emphasis of long duration.
Photographers love the 'golden hour' for its soft, warm light.
Photographers love the 'golden hour' for its soft, warm light.
Technical term in photography.
The clock struck the hour with a deep, resonant chime.
The clock struck the hour with a deep, resonant chime.
'Struck the hour' means it chimed at the exact time.
He spent his lunch hour wandering through the art gallery.
He spent his lunch hour wandering through the art gallery.
'Lunch hour' as a specific daily period.
The witching hour is traditionally thought to be midnight.
The witching hour is traditionally thought to be midnight.
Literary/folklore term.
The report analyzes energy consumption in kilowatt-hours.
The report analyzes energy consumption in kilowatt-hours.
Technical scientific unit.
We waited in the hospital during the long hours of the surgery.
We waited in the hospital during the long hours of the surgery.
'Long hours' conveys emotional weight.
The train service is reduced during off-peak hours.
The train service is reduced during off-peak hours.
'Off-peak hours' are times with less demand.
The existential dread of the final hour is a common literary theme.
The existential dread of the final hour is a common literary theme.
'Final hour' refers to the end of life.
The monastery follows the traditional cycle of canonical hours.
The monastery follows the traditional cycle of canonical hours.
Historical/religious term for prayer times.
The precision of the atomic clock ensures the hour is perfectly synchronized.
The precision of the atomic clock ensures the hour is perfectly synchronized.
Scientific context regarding time measurement.
The hours of idleness in his youth led to a lifetime of reflection.
The hours of idleness in his youth led to a lifetime of reflection.
Abstract use of 'hours' to denote a period of life.
The city’s heartbeat changes as the hour of midnight approaches.
The city’s heartbeat changes as the hour of midnight approaches.
Personification of the city and time.
The archival records provide a window into the social hours of the Victorian era.
The archival records provide a window into the social hours of the Victorian era.
'Social hours' refers to the time spent in society.
The astronomer calculated the sidereal hour with meticulous accuracy.
The astronomer calculated the sidereal hour with meticulous accuracy.
Technical astronomical term.
Each passing hour seemed to etch a new line of worry on her face.
Each passing hour seemed to etch a new line of worry on her face.
Metaphorical description of time's effect.
Common Collocations
Common Phrases
— Sixty minutes from now. It indicates a future point in time.
The train leaves in an hour.
— For a very long time. It emphasizes the length of an activity.
They talked for hours about their childhood.
— At the exact start of every hour (1:00, 2:00, etc.).
The news is broadcast on the hour.
— At any time, especially during the night or at inconvenient times.
The neighbors play loud music at all hours.
— After the usual working or closing time.
We sometimes stay at the office after hours to finish work.
— Calculating or paying based on each hour spent.
You can rent the tennis court by the hour.
— The time just after midnight, typically 1 AM to 4 AM.
I woke up in the early hours of the morning.
— A distance that takes sixty minutes to travel by car.
The airport is about an hour's drive from here.
Often Confused With
Identical pronunciation, but 'our' is a possessive pronoun (e.g., our house).
Used for specific points in time, while 'hour' is used for duration.
In some fast accents, 'are' and 'our/hour' can sound slightly similar.
Idioms & Expressions
— At the very last possible moment before it is too late.
The government reached a deal at the eleventh hour to avoid a strike.
neutral— The person who is currently the most important, famous, or admired.
After winning the game, he was the man of the hour.
informal— The most difficult or unpleasant time in someone's life or history.
The nation stood together during its darkest hour.
literary— The time of night when supernatural events are said to happen, usually midnight.
The baby always wakes up crying during the witching hour.
informal/literary— To go to bed and get up at the same time every day.
My grandfather always kept regular hours to stay healthy.
neutral— The very early morning, just after midnight.
The party continued into the small hours of the morning.
neutral— A time when someone really needs help or support.
She was there for me in my hour of need.
neutral— To do something unimportant while waiting for something else to happen.
I have an hour to kill before my flight, so I'll browse the shops.
informal— The time when someone is most successful or performs best.
The rescue mission was the team's finest hour.
neutral— The exact time when a planned operation or event is set to begin.
Zero hour for the launch is scheduled for dawn.
neutralEasily Confused
Both are units of time.
An hour is much longer than a minute. There are 60 minutes in one hour.
Wait a minute (short) vs Wait an hour (long).
Hour is a type of time.
Time is the general concept; an hour is a specific measurement of that concept.
What time is it? (General) vs How many hours? (Specific).
Hour describes duration.
Duration is the noun for the length of time; hour is the unit used to measure it.
The duration was two hours.
Both refer to a length of time.
A period can be any length; an hour is always exactly 60 minutes.
A period of history vs An hour of class.
Both refer to time segments.
A moment is very short and imprecise; an hour is long and precise.
Wait a moment vs Wait an hour.
Sentence Patterns
It is [number] hour(s).
It is one hour.
I [verb] for [number] hours.
I slept for seven hours.
It takes [number] hours to [verb].
It takes two hours to drive there.
The [noun] lasted [number] hours.
The surgery lasted four hours.
After hours of [noun/gerund], ...
After hours of searching, they found the keys.
The very hour of [abstract noun] ...
The very hour of his departure was kept secret.
In an hour.
I will go in an hour.
Per hour.
The cost is $10 per hour.
Word Family
Nouns
Adjectives
Related
How to Use It
Extremely high; one of the top 1000 words in English.
-
Using 'a hour' instead of 'an hour'.
→
an hour
Because 'hour' starts with a vowel sound, 'an' is required.
-
Saying 'The flight is five hours' when you mean 'The flight is at five o'clock'.
→
five o'clock
Use 'o'clock' for the time on the clock and 'hours' for duration.
-
Writing 'a three-hours exam'.
→
a three-hour exam
In compound adjectives, the noun (hour) should be singular.
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Pronouncing the 'h' in 'hour'.
→
/aʊər/
The 'h' is silent in English for this word.
-
Confusing 'hour' and 'our' in writing.
→
I'll see you in an hour.
'Hour' is time; 'our' is possession.
Tips
The 'An' Rule
Always use 'an' before 'hour' because the 'h' is silent. This is a very common test question and a sign of a good English learner.
Duration vs Point
Use 'hour' for how long something takes and 'o'clock' for the time it happens. 'I studied for an hour at five o'clock'.
Silent H
Pretend the 'h' isn't there. Pronounce 'hour' exactly like the word 'our'. This will make your speaking sound much more natural.
Hyphens in Adjectives
When using 'hour' to describe something else, use a hyphen and no 's'. Write 'a three-hour meeting', not 'a three hours meeting'.
Using 'Half an Hour'
In English, 'half an hour' is the most common way to say 30 minutes. It sounds more natural than saying 'thirty minutes' in casual conversation.
Context Clues
If you hear 'hour' or 'our', look at the words around it. 'In an hour' must be time, while 'our house' must be possession.
Billable Hours
In business, 'hours' often refers to money. If you are a freelancer, tracking your 'hours' is essential for getting paid correctly.
Eleventh Hour
Use this phrase to add flavor to your writing when describing something that happened at the very last second.
Don't Forget the H
Even though you don't say the 'h', you must write it. 'Our' and 'Hour' are different words in writing!
Base 60
Remembering that an hour has 60 minutes helps you calculate time quickly. 'Quarter of an hour' is 15, and 'three quarters' is 45.
Memorize It
Mnemonic
Think of the word 'OUR'. 'OUR' time is measured in an 'HOUR'. Both words sound exactly the same and have the same number of letters if you ignore the silent 'H'.
Visual Association
Imagine a giant clock where the 'H' in 'HOUR' is invisible, leaving only 'OUR'. Visualizing the clock ticking helps associate the word with duration.
Word Web
Challenge
Try to use the word 'hour' three times in the next ten minutes. Use it once to describe a duration, once to describe a rate (per hour), and once with the article 'an'.
Word Origin
The word comes from Old French 'hore', which derived from Latin 'hora'. Further back, it stems from the Greek 'hōra', meaning a season, time of day, or hour.
Original meaning: In ancient Greek, it referred to a limited period of time, such as a season or a specific part of the day, rather than exactly sixty minutes.
Indo-European (Hellenic to Latin to Romance to Germanic/English).Cultural Context
Be aware that 'working long hours' can be a sensitive topic related to labor rights and mental health in many cultures.
In many English-speaking countries, being 'on time' means arriving exactly at the scheduled hour or a few minutes before.
Practice in Real Life
Real-World Contexts
Work and Employment
- working hours
- hourly rate
- overtime hours
- flexible hours
Travel and Transport
- flight duration in hours
- departure hour
- rush hour traffic
- an hour's delay
Socializing
- happy hour
- lunch hour
- meet in an hour
- stay for an hour
Education
- classroom hours
- study for an hour
- exam duration
- office hours
Daily Routine
- sleep for eight hours
- every hour
- half an hour
- on the hour
Conversation Starters
"How many hours of sleep do you usually get each night?"
"What is the busiest hour of the day for you?"
"If you had one extra hour every day, what would you do with it?"
"How long is your commute to work or school in hours?"
"Do you prefer to work flexible hours or a fixed schedule?"
Journal Prompts
Reflect on how you spent the last hour. Was it productive or restful?
Describe your 'golden hour'—what time of day do you feel most creative?
Write about a time when an hour felt like it lasted forever.
If you could travel back in time for just one hour, where would you go?
Discuss the concept of 'rush hour' in your city and how it affects your mood.
Frequently Asked Questions
10 questionsIt is always 'an hour'. In English, the choice between 'a' and 'an' depends on the sound that follows. Since the 'h' in 'hour' is silent, the word starts with a vowel sound (/aʊ/), requiring 'an'. Example: 'I'll be ready in an hour.'
'Hour' refers to a duration or a period of 60 minutes. 'O'clock' refers to a specific point in time on a clock. You say 'The meeting lasted one hour' (duration) but 'The meeting is at one o'clock' (point in time).
There are exactly 60 minutes in one hour. This is a standard measurement used worldwide. For example, if you start a task at 2:00 and finish at 3:00, you have worked for one hour or 60 minutes.
No, 'hour' is almost exclusively used as a noun in English. To describe the action of timing something, you would use the verb 'to time'. For example, 'I timed the race' instead of 'I houred the race'.
This is a common idiom meaning 'at the very last possible moment'. It comes from a biblical parable. For example, 'The two companies reached an agreement at the eleventh hour, just before the deadline'.
Yes, 'hours' is the plural form of 'hour'. You use it for any amount of time greater than one. For example: 'two hours', 'ten hours', or 'many hours'. However, in compound adjectives like 'a two-hour flight', it stays singular.
The silent 'h' is a result of the word's history. It came into English from Old French 'hore', where the 'h' was already silent. English preserved this French-influenced pronunciation while keeping the 'h' in the spelling.
'Rush hour' refers to the times of day when traffic is heaviest because many people are traveling to or from work. Despite the name, rush hour often lasts for more than a single hour in large cities.
'Happy hour' is a period of time, usually in the late afternoon or early evening, when a bar or restaurant sells drinks and sometimes food at reduced prices to attract customers after work.
'Office hours' are the specific times during the day when a professional, such as a doctor, lawyer, or professor, is available to see clients or students in their office. For example, 'The professor's office hours are 2 PM to 4 PM'.
Test Yourself 180 questions
Write a sentence about how many hours you work.
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Describe what you do during your lunch hour.
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Use the idiom 'at the eleventh hour' in a sentence.
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Write a sentence using 'an hour' and 'o'clock'.
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Explain why we say 'an hour' instead of 'a hour'.
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Write a sentence about 'rush hour'.
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How do you 'kill an hour' when you are waiting?
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Describe your 'darkest hour' (metaphorically).
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Write a sentence about 'happy hour'.
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What can you achieve in one hour?
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Use 'per hour' in a sentence about speed.
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Write about a 'three-hour' activity.
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What are your 'office hours'?
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Describe 'the small hours'.
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Who is the 'man of the hour' in your life?
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Write a sentence with 'half an hour'.
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Use 'every hour' in a sentence.
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What is the 'golden hour'?
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Write about 'billable hours'.
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What does 'within the hour' mean?
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Say 'an hour' out loud. Make sure the 'h' is silent.
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Tell me how many hours you sleep.
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Pronounce 'three-hour flight'.
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Say 'at the eleventh hour'.
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How do you say 1:30 in terms of hours?
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Say 'sixty miles per hour'.
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Ask someone about their opening hours.
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Say 'half an hour'.
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Pronounce 'rush hour'.
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Say 'every hour on the hour'.
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How long is your lunch hour?
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Say 'the man of the hour'.
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Pronounce 'kilowatt-hour'.
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Say 'within the hour'.
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Ask 'How many hours takes the flight?'
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Say 'the small hours'.
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Pronounce 'office hours'.
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Say 'I'll be there in an hour'.
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Say 'for hours and hours'.
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Say 'the golden hour'.
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Listen and write the number of hours you hear: 'The train is delayed by three hours.'
Is the speaker saying 'hour' or 'our'? 'This is our house.'
Is the speaker saying 'hour' or 'our'? 'I'll be back in an hour.'
Listen: 'The meeting lasted for half an hour.' How long was it?
Listen: 'We work from 9 to 5.' How many hours is that?
Listen: 'The speed limit is sixty.' Sixty what?
Listen: 'I've been waiting for hours!' Is the person happy?
Listen: 'Happy hour starts now.' What does this mean?
Listen: 'He arrived at the eleventh hour.' Was he on time?
Listen: 'The news is on the hour.' When is the next news if it's 2:15?
Listen: 'I'll see you in an hour.' If it's 4 PM, what time will they meet?
Listen: 'It's a one-hour flight.' How long is the flight?
Listen: 'The office hours are over.' Can you talk to the boss now?
Listen: 'We stayed up into the small hours.' Did they go to bed early?
Listen: 'The battery lasts for an hour.' Is that a long time?
/ 180 correct
Perfect score!
Summary
The word 'hour' is a vital building block for communicating about time. Remember that it always takes 'an' (an hour) and is distinct from 'o'clock', which marks a specific point in time rather than a duration. Example: 'The flight lasts an hour' vs 'The flight is at one o'clock'.
- An hour is a standard unit of time consisting of 60 minutes, used globally for scheduling and measuring duration.
- Grammatically, 'hour' is a countable noun that requires the article 'an' because the initial 'h' is silent.
- The concept of the 24-hour day originated from ancient civilizations and is essential for modern social and professional organization.
- Beyond literal time, 'hour' appears in many idioms like 'eleventh hour' or 'man of the hour' to describe significant moments.
The 'An' Rule
Always use 'an' before 'hour' because the 'h' is silent. This is a very common test question and a sign of a good English learner.
Duration vs Point
Use 'hour' for how long something takes and 'o'clock' for the time it happens. 'I studied for an hour at five o'clock'.
Silent H
Pretend the 'h' isn't there. Pronounce 'hour' exactly like the word 'our'. This will make your speaking sound much more natural.
Hyphens in Adjectives
When using 'hour' to describe something else, use a hyphen and no 's'. Write 'a three-hour meeting', not 'a three hours meeting'.
Example
The movie starts in one hour.
Related Content
Learn it in Context
This Word in Other Languages
Related Phrases
More Time words
adalterward
C1A noun referring to the subsequent phase, state, or lingering consequence that follows a significant alteration or systemic change. It specifically denotes the period of adjustment or the residual effects resulting from a deliberate modification in structure or character.
advent
C1The arrival or beginning of a significant person, event, or invention that changes society or a specific field. It is typically used to mark the start of a new era or the introduction of a major technological advancement.
aeons
C1An indefinitely long period of time; an age. Often used in the plural to exaggerate how long something takes or how much time has passed.
afternoon
A1The period of time between noon and evening. It usually starts at 12:00 PM and ends when the sun begins to set or when the workday finishes.
age
A1Age refers to the amount of time a person has lived or an object has existed. It is also used to describe a particular period in history or a stage of life.
ago
A1Used to indicate a point in time that is a specific distance in the past from the present moment. It always follows a measurement of time, such as minutes, days, or years.
ahead
B1Ahead describes a position further forward in space or time than something else. It is used to indicate movement toward a destination or being in a more advanced state relative to others.
anniversary
C2An anniversary is the annual recurrence of a date that marks a significant past event, ranging from personal celebrations like weddings to historical commemorations. It serves as a temporal marker used to honor, celebrate, or reflect upon the importance of an occurrence over the span of years.
annual
C2To officially declare that a law, contract, marriage, or decision is legally void or invalid. It implies that the subject is cancelled in such a way that it is treated as though it never existed in the first place.
annually
C1The term describes an action or event that occurs once every year. It is frequently used to denote frequency in reports, ceremonies, or natural cycles that repeat on a twelve-month basis.