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过去进行时的构成和用法:
过去进行时的构成:was/were+动词ing形式
1.表示过去某个时刻正在进行的动作,常与at seven yesterday morning,from 8:00 to 10:00等表示过去的时间状语短语或when,while等引导的时间状语从句连用;
Kitty was playing with her friends this time yesterday.
While my parents were working on the computer,I was sleeping.
When I saw her,she was flying the kite.
2.表示过去某段时间正在进行的动作;
He was reading the story during those days.
They were building the bridge last year.
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