过去进行时由was(第一、三人称单数)或were (其余各人称和数)加现在分词所构成。

过去进行时的基本用法

表示在过去某一时刻或某一段时间正在进行的动作，这一特定的时间往往须用时间状语来表示。如：

She was reading an English magazine when I came in.我进来时她在看一本英文杂志。

It was getting dark.天黑了。

They were working all day yesterday.他们昨天整天工作。

We were cleaning the auditorium from 7 to 9 last night.昨晚七点到九点我们在打扫大礼堂。

I met him when he was crossing the street.他过街时我碰见他。

过去进行时的其他用法

1)表示移动的动词go，come，start，stay，leave等的过去进行时，可以表示过去将来发生的动作。如：

They wanted to know when we were leaving for Shanghai. 他们想知道我们什么时候到上海去。

She asked whether he was starting then ext day.她问他是否第二天就动身。

2)动词go的过去进行时态加动词不定式，可以表示在过去某一时间之后将要发生的动作。(比较8.24的3)如：

They said they were going to set up a nursery.他们说他们要设立一个托儿所。

She said the foreign guests were going to visit the Shanghai in dustrial Exhibition.她说外宾要去参观上海工业展览会。

The monitor announced that our new teacher was going to speak to us.班长宣布新老师要跟我们讲话。

3)过去进行时可用来描写故事发生的背景。如：

It was a dark night. The wind was blowing hard and the rain was falling heavily. A young woman suddenly appeared on the riverbank. it was Xier. She had just escaped from Huang Shiren's house.那是一个漆黑的夜晚。风刮得很厉害，雨下得很大。一个年轻妇女突然出现在河岸上。这就是喜儿。她刚从黄世仁的家里逃了出来。