什么是过去进行时？

概念
表示过去某时正在进行的状态或动作。
[编辑本段]过去进行时的主要用法
1.表示过去某一时间内（正在）进行的动作
如：I was doing my homeworks at 9 o'clock p.m. last Sunday.
2.表示一动作发生时，另一动作正在进行
如：I was reading books,while he was cleaning the floor.
3.表示一个动作正在进行时，另一个动作发生了
如：he was playing when I was studying.
4.表示过去将要发生的动作
She told us Mr.Lee was arriving here.
5.用于故事，以提供其时间背景
6.表示礼貌
[编辑本段]常用的时间状语
this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while
My brother fell while he was riding his bicycle and hurt himself.
It was raining when they left the station.
When I got to the top of the mountain, the sun was shining.
[编辑本段]典型例题
(1) Mary ___ a dress when she cut her finger. A. made B. is making C. was making D. makes 答案C. 割伤手指是已发生的事情，应用过去时。同 时，when表时间的同时性，"玛丽在做衣服时"提供事情发生的背景，因此用过去进行时。 (2) As she ___ the newspaper, Granny ___ asleep. A.read； was falling B. was rea