过去进行时常和表示过去的时间状语连用。如：this time yesterday, at that time, then, last night, at 9:00 yesterday, all night等。其构成和现在进行时类似，只需将be变为相应的过去式：was/ were + 动词-ing。如：
What were you doing this time yesterday?
When I was watering the garden, it began to rain.
I was watching TV.
I was writing while my mother was cooking.
难点：
① 过去进行时表示一个过去的动作发生时或发生之后，另一个过去的动作正在进行。过去进行时也可用来表示过去一段时间内持续发生的动作。如：
When I was watering the garden, it began to rain.
当我在花园浇水时，突然下雨了。
While we were having a party, the lights went out.
② 过去进行时还可以表示两个过去的动作同时进行，这时可用连接词while引导。如：
George was reading while his wife was listening to the radio.
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