Grammar Rule in 30 Seconds
Use 'when' to link a specific time, day, or era to a description without using clunky prepositions.
- Place 'when' immediately after a time noun like 'day', 'year', or 'moment'. Example: 'The year when we met.'
- The clause following 'when' must contain a subject and a verb. Example: '...when the sun sets.'
- In informal English, 'when' can often be replaced by 'that' or omitted entirely. Example: 'The day (that) we left.'
Overview
when 大显身手的地方。它就像是为你句子准备的数字时间戳。它能帮你把特定的时刻、日子或时代与描述联系起来，而不会让你的话听起来像本笨重的说明书。把它想象成你最喜欢的 App 里的“链接”按钮。与其说“我记得那一天。我们那时见面了”，你可以更流畅地说，“我记得我们相遇的那天 when we met”。这样感觉更自然，更连贯，让你听起来像个高手。正确使用 when 是让你的英语从“能听懂”跨越到“流利”的小秘诀之一。这就是模糊照片和 4K 大片之间的区别。如果你想让听众看到你所描述的那个精确时刻，when 就是你最好的朋友。只是别用它来描述你在哪儿丢了钥匙——那是完全不同的另一条规则！How This Grammar Works
when 称为关系副词。但别被这个花哨的名字吓到。它的工作其实很简单：它引导一个从句来描述一个关于时间的名词。你有一个“时间词”（名词），然后你想提供更多关于它的信息。你不需要重新开始一个完整的句子，而是用 when 来架起桥梁。例如，如果你在聊“那个时刻”，而那个时刻正是你手滑点赞了前任三年前照片的时候，when 就能完美地连接这两个想法。它有效地替代了像 on which 或 at which 这样的介词短语。虽然说“我们旅行的那一天 on which we traveled”在技术上是正确的，但听起来像是在写 19 世纪的小说。在现代发短信、打游戏和拍 VLOG 的语境下，when 才是王道。它简洁利落，表达清晰，而且能保持说话的节奏。它就像一个指针，告诉你的听众：“嘿，接下来的几个词会告诉你这段特定的时间有什么特别之处。”它是语言版的“请柬”。
Formation Pattern
day、year、time、moment、era、week 甚至是 summer。
when 这个词。这就是你的连接器。
when，但对于 B1 学习者来说，保留它总是更稳妥的。
when + [主语] + [谓语]。
The summer + when + I + started vlogging was amazing. （我开始拍 VLOG 的那个夏天太棒了。）
when 是如何替代对 in 或 at 等介词的需求的。你不用说 “The summer when I started vlogging in”。when 本身就已经包含了“时间”的含义。它简直是省空间神器！
When To Use It
when 几乎出现在现代生活的方方面面。它非常适合 YouTube 上的“Storytime”讲故事视频，或者当你向朋友解释游戏里的一个 bug 时。每当你想要明确一段时期或一个时间点时，就可以使用它。- 社交媒体文案： “回想起那周
when我们只靠冰咖啡和表情包活着的时光。” - 工作与 Zoom 会议： “你还记得演示期间 Wi-Fi 断掉的那次
when吗？” - 旅行与 VLOG： “这就是我们登顶的那一刻
when。” - 怀旧与日常生活： “我怀念那些
when我们可以直接在商场逛好几个小时的日子。” - 设定界限： “告诉我你什么时候有空
when，好让我订餐。”
when 能帮你把成就与特定的年份或职位联系起来。它是把你个人时间线串联在一起的胶水。没有它，你的故事就只是一堆日期和事实的列表，那听起来简直和阅读服务条款页面一样无趣。
Common Mistakes
which 或 that 代替 when。- 介词陷阱： 学习者经常说，“The day
whichI met her.”（错误！）你需要when或者on which。如果你用which，必须带上介词：“The dayon whichI met her.” 但when要自然得多。 - 时间词重复： 避免说 “The time
whenit happenedthen.” 你不需要在从句末尾加then，因为when已经完成了这项工作。这就像戴了两副太阳镜——多此一举，而且有点怪。 - 与 'Where' 搞混： 确保你的名词确实是时间。有时人们会说 “The place
whenI was born.” 除非你是在一个巨大的时钟里出生的，否则你指的可能是 “The placewhereI was born.” - 遗忘名词： 在这些关系从句中，
when需要一个“时间名词”来指代。如果你说 “I rememberwhenwe met”，那是一个略微不同的结构（名词性从句）。对于关系从句，你需要名词：“I remember thetimewhenwe met.”
Contrast With Similar Patterns
when、which 还是 that？这就像为群聊选择正确的表情包一样——语境决定一切。when对比on which/in which： 它们意思相同，但when是那个随性又酷的表亲。在正式邮件或学术论文中使用on which。其他场合都用when。when对比that： 在很多情况下，你可以把when换成that或者干脆删掉它。“The yearwhenI graduated” 和 “The yearthatI graduated” 都可以。不过，when对时间的针对性更强，通常听起来更清晰。when对比where： 这是最简单的一个。如果在日历或时钟上，用when。如果在地图上，用where。- 关系从句对比疑问词： 不要把 “The time
whenwe met” 中的when与 “Whenare we meeting?” 中的when搞混。一个是连接词（关系副词），另一个是疑问词。
when 想象成一种专门的工具。你不会用锤子去修智能手机屏幕，同样，如果你想让表达更流畅，也不应该用 which 来描述一个周六下午。Quick FAQ
我能把 when 用于具体的小时吗，比如 “the hour when the show starts”？
当然可以！when 适用于任何时间单位，从毫秒到千年都行。
省略 when 没问题吗？
没问题，在非正式英语中，我们经常说 “The time we met” 而不是 “The time when we met”。这在发短信时非常普遍。
when 适用于过去、现在和将来吗？
是的！你可以说 “The day when I was born”（过去），“The moments when I feel happy”（现在），或者 “The year when I will travel”（将来）。
when 比 that 更正式吗？
不一定，但它更精确。它向听众发出信号，表明接下来的内容是关于“时间”的解释。
我可以在 'every day' 后面用 when 吗？
可以！“I love the days when the sun is out” 是个很棒的句子。
如果我不确定它是不是时间名词怎么办？
如果你可以针对这个名词问“什么时间？”或“哪一天？”，那它就是时间名词。
是 “the time when” 还是 “the time at which”？
两者都正确，但在日常对话中 “the time when” 要常见得多。“At which” 听起来像是在写法律合同或非常高级的婚礼请帖。
我可以在工作面试中使用 when 吗？
绝对可以。它能帮你清晰地定义经历的阶段，比如 “The two years when I worked at Google”。
Sentence Structure with 'When'
| Time Noun (Antecedent) | Relative Adverb | Subject | Verb Phrase | Function |
|---|---|---|---|---|
|
The day
|
when
|
we
|
met
|
Defining the specific day
|
|
The year
|
when
|
I
|
was born
|
Identifying a specific year
|
|
A time
|
when
|
life
|
was simpler
|
Describing a general period
|
|
The moment
|
when
|
she
|
laughed
|
Capturing a precise point
|
|
The decade
|
when
|
it
|
happened
|
Contextualizing an era
|
Meanings
A relative adverb used to introduce a clause that provides more information about a noun denoting a period of time.
Defining Time
Identifying exactly which time or period is being discussed.
“Sunday is the day when I usually do my laundry.”
“The 1960s was a decade when many social changes occurred.”
Non-Defining Time
Adding extra, non-essential information about a time that is already identified.
“In 2020, when the pandemic started, the world changed.”
“Last Christmas, when we were in London, it actually snowed.”
Formal Substitution
Replacing 'in/on/at which' to make sentences sound more natural.
“The moment when (at which) she realized the truth was dramatic.”
“The era when (in which) dinosaurs lived lasted millions of years.”
Reference Table
| 时间名词 (Time Noun) | 关系副词 | 动作/事件 | 完整例句 |
|---|---|---|---|
|
The day
|
when
|
we met
|
I remember the day when we met.
|
|
The year
|
when
|
I was born
|
What was the year when you were born?
|
|
A time
|
when
|
I need advice
|
She's the person to call at a time when I need advice.
|
|
The moment
|
when
|
he smiled
|
That was the moment when he smiled.
|
|
My childhood
|
when
|
I lived in London
|
My childhood when I lived in London was unforgettable.
|
|
The period
|
when
|
she studied abroad
|
The period when she studied abroad changed her life.
|
|
An occasion
|
when
|
they celebrate
|
Christmas is an occasion when families gather.
|
正式程度
I recall the specific occasion when we first convened. (Memory)
I remember the time when we first met. (Memory)
I remember when we first met. (Memory)
Remember that time we first linked up? (Memory)
按水平分级的例句
I like the time when we eat pizza.
Monday is the day when I go to school.
I remember the moment when you said hello.
Is this the time when the bus comes?
Winter is the season when it snows a lot.
There was a year when we lived in Spain.
I don't like days when it is very cold.
Do you know the hour when the shop opens?
I'll never forget the day when I got my first job.
Can you suggest a time when we can meet tomorrow?
The 1990s was a decade when technology changed fast.
He arrived at a moment when everyone was leaving.
In 2010, when the economy was struggling, many people lost their homes.
There are times when I feel like quitting, but I keep going.
The era when coal was the main fuel is coming to an end.
I need to find a day when both of us are free for a long talk.
The precise juncture when the two companies merged remains a point of debate.
We are living in an age when privacy is becoming a luxury.
Rarely is there a moment when the city is truly silent.
The period when the artist lived in Paris was his most productive.
The zeitgeist of the era, when existentialism reigned supreme, is reflected in his work.
One can scarcely imagine a time when such behavior would have been tolerated.
The very second when the catalyst is added, the reaction begins.
It was a dark epoch when superstition often overrode scientific inquiry.
容易混淆
Learners use 'which' for time because they think of the day as a thing.
In informal English, 'that' can replace 'when', which confuses learners about the 'real' rule.
'Whenever' means 'any time', while 'when' refers to a specific time.
常见错误
The day which I saw you.
The day when I saw you.
I remember when the time.
I remember the time when...
The day when I met you on.
The day when I met you.
When is the day you come?
What is the day when you come?
The summer when it was hot in.
The summer when it was hot.
Sunday is the day when I am going.
Sunday is the day when I go.
The year when I was born it.
The year when I was born.
The time when I spent in Paris.
The time which I spent in Paris.
In 2010 when I was a student I lived in London.
In 2010, when I was a student, I lived in London.
The moment when that I realized...
The moment when I realized...
The era when in which we live.
The era in which we live.
句型
I'll never forget the day when ___.
___ is the time of year when ___.
There are moments when ___.
Can you think of a time when ___?
Real World Usage
Tell me about a time when you handled a conflict.
That moment when the coffee finally kicks in.
Is there a day when the museum is free?
It was a century when empires fell.
Remember the night when we got lost?
The hour when the polls close is 8 PM.
用 when 增加精准度
It was a moment when time stood still.
别把 when 和 where 搞混了
the day when I saw you.
非正式场合可以省略
I remember the day we met.听起来非常自然。但在正式写作中，建议保留它。
美剧字幕里的常客
That was the time when it all started.
用个人回忆来练习
The year when I started university was amazing.
Smart Tips
Try replacing 'when' with 'in which' or 'during which' to sound more academic.
Delete the preposition immediately. 'When' does all the work by itself.
Use 'The moment when' to create a sense of drama and focus.
Try to put 'it' at the end of the clause. If it works, use 'which'. If you need 'on it', use 'when'.
发音
Weak Form of 'When'
In rapid speech, 'when' is often unstressed and sounds like /wən/.
Linking
The 'n' in 'when' often links to the following vowel. 'When I' sounds like 'whe-ni'.
Relative Clause Dip
The day ↘ when we met ↗ was sunny.
The pitch usually drops slightly during the relative clause to show it is parenthetical information.
记住它
记忆技巧
When for the 'When' (time), Where for the 'Where' (place).
视觉联想
Imagine a clock face that has a bridge growing out of it. The bridge connects the clock to a movie screen showing an action. The bridge is labeled 'WHEN'.
Rhyme
If it's a day, a year, or a time, use 'when' to make your sentence climb!
Story
Once there was a lonely 'Monday'. It wanted to tell everyone it was special. It met a connector named 'When'. Together, they became 'The Monday when I won the lottery', and everyone finally understood why it was special.
Word Web
挑战
Write three sentences about your favorite childhood memories using 'The year when...', 'The day when...', and 'The time when...'.
文化笔记
Using 'the time when' is a very common way to start a story or anecdote in English-speaking cultures.
In formal papers, writers often prefer 'the period in which' over 'the time when' to sound more objective.
In both US and UK casual speech, 'when' is frequently dropped if the noun is 'time' or 'day'.
From Old English 'hwanne', which was originally an interrogative adverb.
对话开场白
Can you tell me about a time when you felt really proud of yourself?
What is the best time of year when someone should visit your country?
Do you remember the day when you first started learning English?
Is there a specific hour of the day when you feel most productive?
日记主题
常见错误
Test Yourself
My favorite season is autumn, ___ the leaves change color.
Find and fix the mistake:
The concert which starts at 8 PM is going to be amazing.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
练习题
8 exercisesI'll never forget the day ___ we first met.
The year ___ I spent in Italy was the best of my life.
Find and fix the mistake:
That was the summer when we went to France in.
remember / the / do / you / when / time / we / lost / got / ?
1. The morning... 2. The year... 3. The moment...
You can use 'when' to replace 'on which'.
A: Why do you love autumn? B: It's the season ___ the leaves change color.
I know the day when he arrives.
Score: /8
Practice Bank
12 exercisesI'll never forget the year ___ I graduated from college.
选择正确的句子：
Can you tell me the moment where you knew it was over?
翻译成英文：'我喜欢城市安静的时候。'
将单词排列成句：
将时间短语与正确的 when 从句配对：
This is the restaurant ___ we celebrated my birthday last year.
Tell me a story about a time where you were really brave.
哪个句子是正确的？
翻译成英文：'我珍惜那些我们没有责任负担的日子。'
将单词排列成句：
将句首与正确的结尾配对：
Score: /12
常见问题 (8)
Yes, in informal English, `that` is very common, especially after 'day' or 'time'. Example: 'The day `that` we met.'
Yes, if the time noun is the object of the main clause. 'I remember the day (when) we met.' This is very common in spoken English.
`In which` is much more formal. You would use it in an academic essay, whereas `when` is used in daily conversation.
Absolutely. You can say 'The very second `when` the bomb exploded.' It works for any duration of time.
Because `when` already acts as the prepositional phrase 'on which'. Adding 'on' again is like saying the same thing twice.
As a relative adverb, yes. If there is no noun, it is likely a subordinating conjunction or a question word.
No, `where` is strictly for locations. However, some languages (like French) use the same word for both, which causes confusion.
It is not redundant; it is grammatically standard. While you can say 'I remember when...', adding 'the time' makes it a relative clause.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
cuando / en que
Spanish speakers often forget that 'when' doesn't need a preposition in English.
où / quand
French speakers often say 'the moment where' instead of 'the moment when'.
als / wenn
English uses 'when' for both single past events and general times.
時 (toki)
The word order is reversed, and there is no 'when' equivalent acting as a bridge.
عندما (indama) / حين (hina)
English forbids the resumptive pronoun (e.g., 'the day when I saw him *in it*').
的时候 (de shihou)
Chinese speakers often struggle with the 'Noun + when' order in English.
Learning Path
Prerequisites
Learn These First
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