Tom doesn't have tennis racket,but his sister has one 为什么前面用have 后面要用has

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Tom doesn't have tennis racket,but his sister has one 为什么前面用have 后面要用has
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Tom doesn't have tennis racket,but his sister has one 为什么前面用have 后面要用has
Tom doesn't have tennis racket,but his sister has one 为什么前面用have 后面要用has

Tom doesn't have tennis racket,but his sister has one 为什么前面用have 后面要用has
主语为单数如Tom , his sister 谓语都要用第三人称单数,所以后面的为has, 但是前面为否定,由助动词doesn't 加动词原形,所以用have.

- - doesn't 已经单数了阿 have 怎么再单数

助动词后接动词原形,后面是第三人称单数形式