当一个动作在进行时,另一个动作正在做,什么when,whille,的怎么用.

Question

当一个动作在进行时,另一个动作正在做,什么when,whille,的怎么用.

Answer 1

when,while和as的区别：when引导的从句的谓语动词可以是动词,又可以是瞬时动词.并且when有时表示“就在那时”.例如：
When she came in,I stopped eating.她进来时,我在吃饭.(瞬时动词)
When I lived in the countryside,I used to carry some water for him.当的住在农村时,我常常为他担水.（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.
While引导的从句的谓语动作必须是,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）