when
- adv.什么时候;当时;何时;(用于时间的表达方式之后)在那时;当场;什么情况下;其时;什么场合下
- pron.何时;什么时候
- conj.当…时;在…时候;一…就;在…之后;在…期间;虽然;考虑到;在任何…时候
- n.时候
whenadv.
什么时候；何时；什么情况下；什么场合下
at what time; on what occasion
When did you last see him?
你上次什么时候见到他的？
When can I see you?
我什么时候可以见你？
When (= in what circumstances) would such a solution be possible?
什么情况下可以这么解决？
（用于时间的表达方式之后）在那时，其时
used after an expression of time to mean ‘at which’ or ‘on which’
Sunday is the only day when I can relax.
星期日是我唯一可以休息的日子。
There are times when I wonder why I do this job.
有时候我也不明白自己为什么要干这个工作。
其时；当时；当场
at which time; on which occasion
The last time I went to Scotland was in May, when the weather was beautiful.
我上次去苏格兰是在五月份，那时的天气好极了。
pron.
什么时候；何时
what/which time
Until when can you stay?
你可以待到什么时候？
‘I've got a new job.’ ‘Since when?’
“我有了份新工作。”“什么时候开始的？”
conj.
在…时候；当…时；在…期间
at or during the time that
I loved history when I was at school.
我上学时喜欢历史。
在…之后
after
Call me when you've finished.
你完成后就打电话给我。
在任何…时候
at any time that; whenever
Can you spare five minutes when it's convenient?
方便时能占用你五分钟时间吗？
一…就；刚…就
just after which
He had just drifted off to sleep when the phone rang.
他刚睡着电话铃就响了。
考虑到；既然
considering that
How can they expect to learn anything when they never listen?
既然他们从不听讲，他们怎么能指望学到东西呢？
虽然；然而；可是
although
She claimed to be 18, when I know she's only 16.
她自称是18岁，可是我知道她才16。
used to say that sth may happen at some time in the future, but only when sth else has happened
将来我们具备了条件时就会决定成立这个队。
We'll decide on the team as and when we qualify.
I'll tell you more as and when (= as soon as I can) .
我一有可能就会告诉你更多情况。
when
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1
QUEST (用于疑问句)什么时候，何时
You use when to ask questions about the time at which things happen.When are you going home?...
你什么时候回家？
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2
CONJ-SUBORD (表示两事同时发生)在…时，当…时
If something happens when something else is happening, the two things are happening at the same time.When eating a whole cooked fish, you should never turn it over to get at the flesh on the other side...
吃一整条鱼时，切忌把它翻过来去吃另一面的肉。
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3
CONJ-SUBORD (引导从句，表示某事发生于另一活动、事件或情形期间)在…的过程中
You use when to introduce a clause in which you mention something which happens at some point during an activity, event, or situation.When I met the Gills, I had been gardening for nearly ten years.
遇到吉尔一家时我已经做了近10年的园艺工作。
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4
CONJ-SUBORD (引导从句，说明主句动作已经发生或将要发生时的情况)其时
You use when to introduce a clause where you mention the circumstances under which the event in the main clause happened or will happen.When he brought Imelda her drink she gave him a genuine, sweet smile of thanks...
当他把饮料拿给艾梅尔达时，她真诚而甜美地向他微笑以示感谢。
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5
CONJ-SUBORD (尤用于动词和形容词后引导从句，表示某事发生的时间)什么时候,何时
You use when after certain words, especially verbs and adjectives, to introduce a clause where you mention the time at which something happens.I asked him when he'd be back to pick me up...
我问他什么时候回来接我。
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6
PRON-REL (用于引导从句，限定或指示某事发生的时间)…的时候
You use when to introduce a clause which specifies or refers to the time at which something happens.He could remember a time when he had worked like that himself...
他还能记得自己一度工作起来也是那个样子。
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7
CONJ-SUBORD (用于引出某个观点、评论或问题的原因)既然，考虑到
You use when to introduce the reason for an opinion, comment, or question.How can I love myself when I look like this?...
我这个样子，怎么能对自己满意呢？
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8
CONJ-SUBORD (用于引出使句子的其他部分显得让人吃惊或不大可能的事实或评论)虽然，然而,可是
You use when in order to introduce a fact or comment which makes the other part of the sentence rather surprising or unlikely.Our mothers sat us down to read and paint, when all we really wanted to do was to make a mess...
我们的母亲让我们坐下来读书和画画，而我们真正想做的却是打打闹闹。
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When was the last time you saw her ?
你上次是什么时候见到她的？
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Since when did he ever listen to me ?
他什么时候听过我的话？
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Some people don 't know when they 're well off .
有些人身在福中不知福。
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There are bound to be changes when the new system is introduced .
引进新系统后一定会发生变化。
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You can 't take your money with you when you go .
你不可能把钱带进棺材。
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When I left they were all still hard at it .
我离开的时候他们都还在努力工作。
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When is the best time to ring New York ?
什么时间给纽约打电话最好？
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She 's very nice when you get to know her .
你了解她以后就会觉得她非常可爱。
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You should have seen her face when she found out !
你真该看看她发现事情真相时脸上的表情！
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When they set out they were well prepared .
他们出发时有很充分的准备。
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When do the new regulations come into force ?
新规章什么时候开始执行？
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I try not to stress out when things go wrong .
出问题时，我尽量不紧张。
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When did this word come into common use ?
这个词是什么时候普遍使用起来的？
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When do you start your new job ?
你什么时候开始新工作？
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We need to discuss when we should go .
我们需要商量一下什么时候动身。
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When did you last have a period ?
你上一次月经是什么时候？
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When are you going to get a proper job ?
你想什么时候去找一份正经的工作呀？
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It was getting late when she finally showed up .
天色已晚，她终于赶到了。
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When did you take your driving test ?
你什么时候参加的驾驶执照考试？
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When did you last see him ?
你上次什么时候见到他的？
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When did you see him last ?
你最近什么时候见过他？
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When will I see you again ?
我何时能再见到你？
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When it comes to the point , he always changes his mind .
他总是临时变卦。
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When things got too hot most journalists left the area .
事态发展到过于严峻时，大多数记者便撤离了这个地区。
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What 's the form when you apply for a research grant ?
申请科研补助金按常规应该怎么办？
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I just love it when you bring me presents !
我就喜欢你送我礼物！
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Drop me a line when you get there .
你到那儿后给我写封信。
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Put it back in its place when you 've finished with it .
用毕放回原处。
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Good posture is essential when working at the computer .
用电脑工作时良好的姿势极其重要。
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Your feet must be behind the line when you serve .
发球时你的脚必须站在底线的外面。
所引导的状语从句中，谓语可以是延续性动词，也可以是瞬时动词，其动作既可以和主句的动作同时发生，也可以在主句的动作之前或之后发生。
He got engaged to Lucy when travelling last autumn.
去年秋天旅行时，他与露西订了婚。
It was raining when we arrived.
我们到的时候正在下雨。
Turn off the switch when anything goes wrong with the device.
如果装置出故障，就把开关关掉。
引导状语从句时，侧重指从句中的动作与主句中的动作同时发生或同时进行，一般持续时间不长，其谓语可以是延续性动词，也可以是瞬时动词。
She was coming in as he was going out.
她进来的时候，他正要出去。
I caught a whiff of perfume as she swept past me.
她从我身边走过时，我闻到一股香水味。
Joe jumped onto the bus just as it was pulling away.
正当公共汽车开动时，乔跳上了车。
指在某事发生之际或发生的过程中，另一事又发生。所引导的状语从句中，谓语应为延续性动词，而不用瞬时动词，强调其动作与主句中的动作同时发生，但持续时间一般较长；有时也可指主句的动作在从句的动作过程中发生。
Don't interrupt him while he is thinking.
他在思考时别去打搅他。
She got married while working as a waitress.
她在饭店当服务生期间结婚了。
Pat killed time by watching TV while waiting for her.
帕特在等她时边看电视边打发时间。
- 习语