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一般过去时：

1.概念：过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为。

2.时间状语：ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.

3.基本结构：be动词;行为动词

4.否定形式：was/were+not;在行为动词前加didn't，同时还原行为动词。

5.一般疑问句：was或were放于句首;用助动词do的过去式did 提问，同时还原行为动词。

6.例句：She often came to help us in those days.

I didn't know you were so busy.