中考英语重要短语的用法及区别:as , when , while
When:可与一个点的时间或表示一段的时间连用,从句动词可以是短暂性或延续性动词。从句的动作和主句的动作可以同时,也同先于主句的动作。
When the teacher came in , the students stood up . 当老师进来时,学生们起立。
While:只指一段时间,不能指一点时间。因此while从句中的谓语动词必须是延续性动词。表示一段较长的时间或一个过程,主句和从句的动作同时发生。
Don't talk while you are eating . 吃饭时你不要说话。
As:主句和从句的动作同时发生,有时可译作“一边……,一边”。
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