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When he looked back, the girl had vanished．他回头望时那姑娘已经不见了。
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从句中有些成分有时可以省略：
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He got engaged to her when travelling last winter．他去年冬天旅行时和她订了婚。
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Metals expand when heated and contract when cooled．金属热则膨胀冷则收缩。
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Often she would weep when alone．她一人呆着时常常哭泣。
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When at Rome do as the Romans do．入乡随俗。（谚语）
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在某些情况下可有特殊的译法：
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I was just coming along to see you when I ran into Wilson．我正要来看你时碰到了威尔逊。
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I had not been reading for half an hour when I heard steps outside．我看书还不到半小时就听见外面有脚步声。
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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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