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Mary does not have any books(改成肯定句) Mary has some books.

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Mary does not have any books(改成肯定句) Mary has some books.
has不是用于第三人称单数么?为什么Mary does not have any books这里面用的是have?后来改成肯定句又改为has?
Mary does not have any books(改成肯定句) Mary has some books.
你好:
否定句中的does已经体现了第三人称单数,后面就不需要改变了.肯定句中没有助动词,就要加s

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