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Why are you here when you should be in school?你本该上学的,为什么在这里?
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Why do you walk when you have a car?你有车为什么还步行?
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(3)when还可用作关系代词引导定语从句:
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There are moments when I forget all about it.有的时候这事我全忘了。
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At the time when I saw him, he was well.我见到他时他还是好好的。
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There are times when such things are necessary.有时候这样做是必要的。
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Sunday is a holiday, when people do not go to work.星期天是假日,(这天)人们不上班。
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△有时和since连用,表示“从那时起”:
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That was in 1929, since when things have been better.那是1929年的事,从那时起情况就好些了。
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They left on Monday, since when we have heard nothing.他们是星期一走的,从那以后我们就没听到什么消息了。
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有时用作表语:
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That was when I was thirteen.这是我13岁时的情形。
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whenever可用作连词,表示“每当”、“每次”等:
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Whenever she looked at Lanny she smiled.每次她望着兰尼时都会笑笑。
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Whenever we see him we speak to him.我们每次见到他时都和他说几句。
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I go to the theatre whenever I get the chance.每当我有机会我都去看戏。
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也可表示“在任何时候”:
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You can have it whenever you like.任何时候你愿意你都可以用。
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Come and see me whenever you want to.随便什么时候你想来看我你就来。
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You may leave whenever you please.你高兴随时可以走。
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在上面两种情况下,从句中都可以省去某些成分:
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Use the simple verb whenever possible.在可能时使用简单动词。
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We arranged for him to come whenever needed.我们安排好任何时候需要他就让他来。
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有时还可用来代替when,表示强调:
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Whenever will you grow up?你什么时候才能长大?
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