Having conversations with friends doesn't help at all.为什么用do

问题描述:

Having conversations with friends doesn't help at all.为什么用doesn't不用isn't
1个回答 分类:英语 2014-10-27

问题解答:

我来补答
doesn't是助动词,后面要跟动词原形.
而isn't是系动词,后面跟名词或动词加-ing.
希望对你有用.
 
 
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