4.过去进行时行时与一般过去时的区别：

过去进行时表示在过去某时间里正在进行的动作或存在的状态，一般过去时则表示一个发生在过去的动作或状态，一般说来该动作已完成。例如：

They were writing a letter to their pen-pals last night.

(表示他们在昨晚某时刻正在做的动作，但不强调信是否写完)

They wrote a letter yesterday.(表示一个完整的动作)

辨析：when与while

(1)when adv. (关系副词)当…… 时;(疑问副词)什么时候，何时

When will he come? 他什么时候来?

It was raining when they started. 他们动身时正下着雨。

We’ll start when the team leader comes. 队长一来，我们就出发。

(2)while conj. 当……的时候，和……同时

While he was eating, I asked him to lend me $ 2.

当他正在吃饭时，我请他借给我2美元。

when=at that time 当……的时候，其动作可以是延续性动作，也可以是瞬间的动作。

e.g.When I came in, he was reading.

When I was a child, I liked soccer very much.

while=during the time that… 在……期间，与其连用的动作通常是延续性的动作，不与瞬间的动词连用(其引导的从句通常用过去进行时)。

While her children were doing their homework, she was doing some housework.

当她的孩子们在做作业时，她在做家务活。

While the students were reading the new words, the teacher walked around in the classroom.

初二英语上册知识点：一般过去进行时就为同学们提供到此，更多初二英语知识点请进入初二英语专栏查阅~

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