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. (用于疑问句)什么时候，何时
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When are you going home?.
你什么时候回家？
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When did you get married?.
你什么时候结的婚？
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When is the press conference?.
记者招待会何时举行？
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When were you in this house last?.
你最后一次在这房子里是什么时候？
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'I'll be there this afternoon.' — 'When?'
“我今天下午会去那里。”—“什么时间？”
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. (表示两事同时发生)在…时，当…时
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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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Mustard is grown in the field when weeds are there, rather than when the growing crops are there.
芥菜要在地里长杂草而不是长庄稼时种植。
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. (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
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. (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
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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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I'll start to think about it when I have to write my report.
我要写报告时会对此予以考虑的。
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. (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
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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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I don't know when the decision was made.
我不知道决定是什么时候作出的。
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It is important to check when the laboratory can do the tests.
核实一下实验室何时可以进行这些测试是很重要的。
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. (用于引导从句，限定或指示某事发生的时间)…的时候
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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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She remembered clearly that day when she'd gone exploring the rockpools.
她清楚地记得她去岩石区潮水潭探险的那天。
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In 1973, when he lived in Rome, his sixteen-year-old son was kidnapped.
1973年他在罗马居住时，他16岁的儿子遭到了绑架。
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. (用于引出某个观点、评论或问题的原因)既然，考虑到
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. (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
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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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The temperature sensor is making the computer think the engine is cold when, in fact, it's hot.
温度传感器发给计算机的信息为发动机是冷却的，可实际上它的温度很高。
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