文档介绍：过去进行时定义
过去进行时表示过去某一时刻或某一段时间内正在进行或发生的动作。
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4. 用法：
1）表示在过去某一时间或时刻内正在进行或发生的动作，通常和表示时间点的时间状语连用。
What were you doing at eight last night?
昨晚八点你在干什么？
2）表示过去某一段时间内正在进行或持续进行的动作。
David was writing a letter to his friend last night.
大卫昨晚一直在给他的朋友写信。(信不一定写完。)
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3）表示在过去某个动作发生的时候，另一个动作也在进行。
He was reading in the library when the rainstorm came.
暴风雨来的时候他在图书馆看书。
4）表示两个动作同时进行，与while连用。
While Linda was sleeping, Jenny was helping Mary with her
homework. 琳达在睡觉的时候, 珍妮在帮助玛丽做作业。
5）与always连用表示不断重复的过去的动作。
Lily was always singing at night last year.
莉莉去年晚上总是唱歌。
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过去进行时的结构
否定形式
问句形式
was/were + not + doing
Was/Were+主语+doing
was/were + doing
He was sleeping at that time.
He wasn’t sleeping at that time.
Was he sleeping at that time?
肯定形式
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过去进行时标志词
then, at that time, this time yesterday, at 5 o’clock last night, all night, all the morning, from 7:00 to 9:00 yesterday…
They were having a class this time yesterday.
I was drawing a horse when the teacher came in.
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【典例1】Little Tom ______ computer games when his mother got home.
A. is playing B. plays
C. was playing D. playing
考查时态。句意：当妈妈到家的时候，小汤姆正在玩电脑游戏。when引导时间状语从句，主句多用进行时，时间发生在过去，故用过去进行时。
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【典例2】 Turn off the water while you ______ your teeth or washing your hands.
A. were