past tense和past continue tense怎样区别啊

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/30 13:14:51

过去时主要是指过去发生的动作或存在的状态
而过去进行时表示过去某阶段正在进行的动作,通常有时间暗示.
I did my homework yesterday .
I was doing my homework this time yesterday .
再问： While the pupils were doing classwork,their teacher returned. 这个句子都没有时间暗示，那为什麼要用Past continue tense呢？
再答：这里是属于时间状语从句中的过去进行时，当小学生们当时正在做功课的时候，老师返回来了。 while/when/as 引导的时间状语从句如果是长时间动词，主句是短时间动词，长时间动作用过去进行时，短动作用一般过去时。 While /When /As she was walking on the street, it began to rain. 还有这样的句子， I was cooking when someone knocked at the door.

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