when 的英语意思
whenwhen /wen/ adverb, conjunction, pronoun 
查看全部语言翻译1at what time在什么时候: 
When are we leaving?我们什么时候出发？ When did you first meet Dr Darnall?你是什么时候第一次见到Darnall博士的？ When will the work be finished?这项工作什么时候能完成？ I don’t know when I’ll see her again.我不知道什么时候还能再见到她。when to do something I’ll tell you when to stop.我会告诉你什么时候停下来的。2at or during the time that something happens在某事发生之时或期间: Leonard was nine when his father died.伦纳德九岁时，父亲去世了。 When the family came here from Russia, they were penniless.这家人从俄罗斯来到这里时，身无分文。 When he was in the air force he flew Tornado jets.他在空军服役期间，驾驶过"狂风"喷气式战机。3after or as soon as something happens在某事发生之后，或一发生就: When the meal was finished, Rachel washed up and made coffee.饭吃完后，Rachel洗了碗，又泡了咖啡。 I’ll phone you again when I get home.我到家后会再给你打电话。4used to mention a type of event or situation when talking about what happens on occasions of that type用于提及某类事件或情境时，说明此类情况下通常发生的事: When lead is added to petrol, it improves the car’s performance.在汽油中加入铅，可以提升汽车的性能。 When mixed with water the powder forms a smooth paste.这种粉末与水混合后，会形成光滑的糊状物。 He always wears glasses except when playing football.他总是戴眼镜，只有踢足球时除外。5used to show which particular time or occasion you are talking about用于指明所谈论的是哪个特定的时间或场合: The best moment was when he scored the winning goal.最精彩的时刻是他打入致胜进球时。 There are times when I hate him.有时候我真的恨他。the day/time/afternoon etc when She remembered the day when Paula had first arrived.她记得Paula第一次到来的那天。6by/since when before or since which time在此之前，或自此以来: The baby is due in May, by when the new house should be finished.宝宝预计五月份出生，届时新房子应该已经建好了。 That was written in 1946, since when the education system has undergone great changes.那是1946年写的，自那以后，教育体系发生了巨大变化。7since when ...? spoken口语 used to show that you are very surprised or angry用于表达极度惊讶或愤怒: Since when have you been interested in my feelings?你什么时候开始对我的感受感兴趣了？8even though something is true尽管某事是真实的: Why does she steal things when she could easily afford to buy them?她明明买得起，为什么还要偷东西？9used to introduce a fact or statement that makes something seem surprising用于引出使某事显得出乎意料的事实或说法: When you consider that the airline handled 80 million passengers last year, the accident figures are really very small.想到这家航空公司去年运送了八千万名旅客，事故数字其实非常之小。GRAMMAR: Choosing the right tense语法：选择正确的时态• You use the present tense with when: · What are you planning to do when you leave college?• 与 when 连用时使用一般现在时：· 你打算大学毕业后做什么？• Don’t use ‘will’ in the clause after when. ✗Don’t say: What are you planning to do when you will leave college?• 不要在 when 后面的从句中使用"will"。✗不要说：What are you planning to do when you will leave college?• You can also use the present perfect tense with when: · What are you planning to do when your course has finished?• 与 when 连用时也可以使用现在完成时：· 你的课程结束后打算做什么？• When talking about the past, you can use the past perfect tense with when: · When the rain had stopped, they went outside.Grammar guide ‒ VERBS• 谈论过去时，与 when 连用可以使用过去完成时：· 雨停了之后，他们走了出去。语法指南 ‒ 动词THESAURUS同义词辨析when at or during the time that something happens在某事发生之时或期间: · Call me when you get home.· 到家后给我打电话。· When I got here, the place was empty.· 我到这里时，这地方空无一人。while during the time that something is happening – used to emphasize that something is continuing在某事正在发生的期间——用于强调某事在持续进行中: · I’ll make the salad while you set the table.· 你来摆桌子，我来做沙拉。· While we were on holiday, our house was burgled.· 我们度假期间，家里遭了盗窃。whenever used in order to emphasize that something always happens when another thing happens用于强调每当另一件事发生时，某事总会发生: · He visits his mother whenever he can.· 他只要有机会就去看望母亲。· You can come and talk to me whenever you have a problem.· 你有任何问题随时都可以来找我谈谈。by the time used in order to say that one thing has or will have already happened when something else happens用于表示当另一件事发生时，某事已经或将已经发生: · By the time a child is five, he will have watched hundreds of hours of television.· 一个孩子到了五岁，将已经看了数百小时的电视。
查看全部语言翻译1at what time在什么时候: When are we leaving?我们什么时候出发？ When did you first meet Dr Darnall?你是什么时候第一次见到Darnall博士的？ When will the work be finished?这项工作什么时候能完成？ I don’t know when I’ll see her again.我不知道什么时候还能再见到她。when to do something I’ll tell you when to stop.我会告诉你什么时候停下来的。2at or during the time that something happens在某事发生之时或期间: Leonard was nine when his father died.伦纳德九岁时，父亲去世了。 When the family came here from Russia, they were penniless.这家人从俄罗斯来到这里时，身无分文。 When he was in the air force he flew Tornado jets.他在空军服役期间，驾驶过"狂风"喷气式战机。3after or as soon as something happens在某事发生之后，或一发生就: When the meal was finished, Rachel washed up and made coffee.饭吃完后，Rachel洗了碗，又泡了咖啡。 I’ll phone you again when I get home.我到家后会再给你打电话。4used to mention a type of event or situation when talking about what happens on occasions of that type用于提及某类事件或情境时，说明此类情况下通常发生的事: When lead is added to petrol, it improves the car’s performance.在汽油中加入铅，可以提升汽车的性能。 When mixed with water the powder forms a smooth paste.这种粉末与水混合后，会形成光滑的糊状物。 He always wears glasses except when playing football.他总是戴眼镜，只有踢足球时除外。5used to show which particular time or occasion you are talking about用于指明所谈论的是哪个特定的时间或场合: The best moment was when he scored the winning goal.最精彩的时刻是他打入致胜进球时。 There are times when I hate him.有时候我真的恨他。the day/time/afternoon etc when She remembered the day when Paula had first arrived.她记得Paula第一次到来的那天。6by/since when before or since which time在此之前，或自此以来: The baby is due in May, by when the new house should be finished.宝宝预计五月份出生，届时新房子应该已经建好了。 That was written in 1946, since when the education system has undergone great changes.那是1946年写的，自那以后，教育体系发生了巨大变化。7since when ...? spoken口语 used to show that you are very surprised or angry用于表达极度惊讶或愤怒: Since when have you been interested in my feelings?你什么时候开始对我的感受感兴趣了？8even though something is true尽管某事是真实的: Why does she steal things when she could easily afford to buy them?她明明买得起，为什么还要偷东西？9used to introduce a fact or statement that makes something seem surprising用于引出使某事显得出乎意料的事实或说法: When you consider that the airline handled 80 million passengers last year, the accident figures are really very small.想到这家航空公司去年运送了八千万名旅客，事故数字其实非常之小。GRAMMAR: Choosing the right tense语法：选择正确的时态• You use the present tense with when: · What are you planning to do when you leave college?• 与 when 连用时使用一般现在时：· 你打算大学毕业后做什么？• Don’t use ‘will’ in the clause after when. ✗Don’t say: What are you planning to do when you will leave college?• 不要在 when 后面的从句中使用"will"。✗不要说：What are you planning to do when you will leave college?• You can also use the present perfect tense with when: · What are you planning to do when your course has finished?• 与 when 连用时也可以使用现在完成时：· 你的课程结束后打算做什么？• When talking about the past, you can use the past perfect tense with when: · When the rain had stopped, they went outside.Grammar guide ‒ VERBS• 谈论过去时，与 when 连用可以使用过去完成时：· 雨停了之后，他们走了出去。语法指南 ‒ 动词THESAURUS同义词辨析when at or during the time that something happens在某事发生之时或期间: · Call me when you get home.· 到家后给我打电话。· When I got here, the place was empty.· 我到这里时，这地方空无一人。while during the time that something is happening – used to emphasize that something is continuing在某事正在发生的期间——用于强调某事在持续进行中: · I’ll make the salad while you set the table.· 你来摆桌子，我来做沙拉。· While we were on holiday, our house was burgled.· 我们度假期间，家里遭了盗窃。whenever used in order to emphasize that something always happens when another thing happens用于强调每当另一件事发生时，某事总会发生: · He visits his mother whenever he can.· 他只要有机会就去看望母亲。· You can come and talk to me whenever you have a problem.· 你有任何问题随时都可以来找我谈谈。by the time used in order to say that one thing has or will have already happened when something else happens用于表示当另一件事发生时，某事已经或将已经发生: · By the time a child is five, he will have watched hundreds of hours of television.· 一个孩子到了五岁，将已经看了数百小时的电视。