when和while的区别

①when意为"在……时;当……时",可表示"点时间"或"段时间",从句谓语可以是终止性动词,也可以是延续性动词。例如:

When I got home, he was having supper.

③while只可表示"段时间",从句谓语只限于延续性动词。例如:

While I was sleeping, my father came in.

注:从句谓语是持续性动词时,when、while和as可以互换?主?从句谓语都是终止性动词时,when与as可互换?从句谓语表示状态时,通常用while。

一。引导时间状语从句时，WHILE连接的是时间段，而WHEN连接的多是时间点

例如What does your father do while your mother is cooking?

What does your mother do when you come back?

二，WHILE可以连接两个并列的句子，而WHEN不可以

例如I was trying my best to finish my work while my sister was whtching TV

三，WHEN是特殊疑问词，对时间进行提问，WHILE不是。

例如，When were you bron?