1 、表示过去某个时间发生的动作或情况(包括习惯性的动作或状态)
e.g. When did you read the novel?
She often came to help us in those days.
2 、谈到过去的情况时
e.g. I didn`t know you were so busy.
3 、谈到已死人的情况时
e.g. Lei Feng was a great communist fighter.
与这个时态连用的时间状语常有：
yesterday, last night, the other day, two months ago, in 1985, then, just now,
when, after, as soon as 引导的时间状语从句，表示主句动作开始的时间。
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