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知识点总结 在复合句中，由时间连接词引导的状语从句叫做时间状语从句。时间状语从句通常由when, while, as，after,before,since,until等词引导。 一、时间状语从句种类 1、引导的从句表示主从句的动作同时发生，或从句的动作在主句之前。when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。例如： When she came in, I stopped eating.她进来时，我停止吃饭。(瞬时动词) When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。(延续性的动词) We were about to leave when he came in.我们就要离开，就在那时他进来了。 2、Wh ile引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生(或者相对应)。并且while有时还可以表示对比。例如： While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时 发生) I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。(对比) 3、As表示一边一边，as引导的动 作是延续性的动作，一般用于主句和从句动作同时发生;as也可以强调一先一后。例如： We always sing as we walk.我们总是边走边唱。(as表示一边一边) As we was going out, it began to snow.当我们出门时，开始下雪了。(as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间) | 
