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主谓一致的have和has怎么用,它代表什么

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主谓一致的have和has怎么用,它代表什么
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答案和解析
当主语为非第三人称单数,如:I / you / they/ we 等时用have
如:We have a big classroom.
I have waited for you for about two hours.
但主语为第三人称单数,如:he/ she/ it 等时用has
如:My sister has a nice watch.
Tom has already finished doing his homework.
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