在句型上,when和while有什么区别?
1个回答

when：当……时候,在……时候；既然

当……时候：谓语动词可以是短暂性或持续性的动词.如：

I arrived at home when the telephone rang.(短暂性动词,电话响那时刻)

He was doing the homewok when I watching TV.(看电视是持续性动作)

既然:Why you choose as a teacher when you don't like children?你既然不喜欢小孩子,为什么要当老师呢?

while:在……期间,当……；而,却

当……：谓语动词必须是持续性的.如：

I was doing the housework while she was cooking.(我做家务时,她在做饭.做饭是可持续动作,所以可以用while,也可以用when)

而:表转折时,不可以用when,如:

I like apple while he likes banana.(用于比较和转折)

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