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while 和 while

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when/while 是时间状语从句的引导词

when

when 引导的(从句谓语动词),可以是延续性的,也可以是瞬间的

例:瞬间动词 —— come in

When she came in, I stopped reading. 她进来时,我停止看书了。

例:延续性的 —— lived,住

When I lived in that city, he used to come to visit me. 我在那个城市的时候,他经常来看我。

有,when 可以表示 “就在那时”

We were about to leave when he came in.
当他进来的时候,我们真准备离开。
我们就要离开,就在那时他进来了。

while

while 引导的 必须是延续性的。并且强调 主句 和 从句 的动作同时发生(或者相对应)

While my wife was reading the newspaper, I was watching TV.
我妻子在看报纸的时候,我在看电视。

阅读是一个持续性动作

while 还可以表示对比,如:

I like playing football while you like playing basketball.
我喜欢踢足球,而你喜欢打篮球。

只能使用 when 而不能用 while 的情况

1、 从句 动词 发生在主句之前

When I was washing my clothes, he called me.
我正在洗衣服时,他给我打了电话。

called 是主句

2、从句 动词 发生在主句之后

When I got to the cinema, the tickets had been sold out.
我到达影院时,票已经卖光了。

When I got to the cinema 是从句