文档介绍：状语从句
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状语从句按其意义和作用可分为:

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1、时间状语从句
引导时间状语从句的从属连词有：
when, while, as, whenever, before, after, since, till, until, as soon as, once, hardly…when, no sooner…than等引导。如：
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When he was still a young man, he was forced to leave his homeland for political reasons.
It has been 15 years since he left.
I’ll tell him the news as soon as I see him.
Once you have got used to it, you will like it.
I waited till he had finished his work.
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注意：
1. when, while , as
when(1)表“当…的时候”，即可引导持续性动作，又可引导短暂性动作。如：I was fat when I was a child.
When they came home, I was
cooking dinner.
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when (2)表“突然；就在那时”句型有：
…was/were doing … when sb. did……was / were about to do …when sb. did…
…had (not) done …when sb. did…
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I was walking in the street when I saw him.
Tom was about to tell the teacher everything when his deskmate stopped him.
She had not been married many weeks when the man saw her and was struck by her beauty.
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while (1)表“当…的时候”指的是“在某一时间里”，“在……期间”，从句里的动作必须是持续性的，它也强调主句和从句动作的同时发生，往往侧重主句和从句动作的对比。
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如：
While he was in London, he studied music.
While we were watching TV, he was writing a composition.
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while (2)也可做并列连词，表示对照的含义，意思为“而，然而；虽然”。如：
He is tall while his brother is short.
While I understand your viewpoint, I don’t agree with you.
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