didn't know you were so busy.

问题描述:

didn't know you were so busy.
为什么这个句子里有两个过去时?不是每个句子里只能有一个吗?
1个回答 分类:英语 2014-09-17

问题解答:

我来补答
I didn't know you were so busy这是个that引导的宾语从句.我们知道,在宾语从句中如果主句的谓语动词用一般过去时,那么宾语从句的谓语动词就要用过去时的某种形式.所以宾语从句部分的谓语动词要用过去时.
 
 
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