when

adverb

/wen/

(used in questions用于问句) at what time; on what occasion什么时候；何时；什么情况下；什么场合下
- 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？
used after an expression of time to mean ‘at which’ or ‘on which’（用于时间的表达方式之后）在那时，其时
- 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。
at which time; on which occasion其时；当时；当场
- 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。

词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.

when

pronoun

/wen/

what/which time什么时候；何时
- 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？”
词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.

when

conjunction

/wen/

Idioms

at or during the time that在…时候；当…时；在…期间
- I loved history when I was at school.我上学时喜欢历史。
after在…之后
- Call me when you've finished.你完成后就打电话给我。
at any time that; whenever在任何…时候
- Can you spare five minutes when it's convenient?方便时能占用你五分钟时间吗？
just after which一…就；刚…就
- He had just drifted off to sleep when the phone rang.他刚睡着电话铃就响了。
considering that考虑到；既然
- 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？
although虽然；然而；可是
- 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 岁。

词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’.

Idioms

as and when

used to say that something may happen at some time in the future, but only when something else has happened（用于在特定条件下才会发生的事情）将来…时，到时候
- We'll decide on the team as and when we qualify.将来我们具备了条件时就会决定成立这个队。
- 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。

if and when

used to say something about an event that may or may not happen（用于在特定条件下才会发生的事情）将来…时，到时候
- If and when we ever meet again I hope he remembers what I did for him.倘若我们再次见面，我希望他还记得我为他做的事。

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词汇	when
释义	when adverb /wen/ /wen/ (used in questions用于问句) at what time; on what occasion什么时候；何时；什么情况下；什么场合下 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？ used after an expression of time to mean ‘at which’ or ‘on which’（用于时间的表达方式之后）在那时，其时 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。 at which time; on which occasion其时；当时；当场 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。词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’. when pronoun /wen/ /wen/ what/which time什么时候；何时 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？” 词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’. when conjunction /wen/ /wen/ Idioms at or during the time that在…时候；当…时；在…期间 I loved history when I was at school.我上学时喜欢历史。 after在…之后 Call me when you've finished.你完成后就打电话给我。 at any time that; whenever在任何…时候 Can you spare five minutes when it's convenient?方便时能占用你五分钟时间吗？ just after which一…就；刚…就 He had just drifted off to sleep when the phone rang.他刚睡着电话铃就响了。 considering that考虑到；既然 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？ although虽然；然而；可是 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 岁。词源Old English hwanne, hwenne; of Germanic origin; related to German wenn ‘if’, wann ‘when’. Idioms as and when used to say that something may happen at some time in the future, but only when something else has happened（用于在特定条件下才会发生的事情）将来…时，到时候 We'll decide on the team as and when we qualify.将来我们具备了条件时就会决定成立这个队。 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。 if and when used to say something about an event that may or may not happen（用于在特定条件下才会发生的事情）将来…时，到时候 If and when we ever meet again I hope he remembers what I did for him.倘若我们再次见面，我希望他还记得我为他做的事。
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