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116问答网 > after和before引导时间状语从句时具体怎么个用法

after和before引导时间状语从句时具体怎么个用法

2025-03-15 17:21:30

推荐回答（2个）

回答1：

Before 和 after 引导的时间状语从句中，由于 before 和 after 本身的词义已经能够表明动作发生的先后，所以主句可以用一般时代替完成时，也可以用完成时。
I knew/had known her long before you knew her.
我认识她早在你认识他之前。
After you finish/have finished all your homework,you can watch TV this evening.
你完成所有的作业后，今晚可以看电视。

回答2：

You have to be here before I am and leave here after I leave.
你必须在我之前到这里，在我离开后才能走。
例子如上。

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