主谓一致的have和has怎么用,它代表什么

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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只有单三用has，其他用have，I，you，we用have，其他用has，按好记的原则基本是这样

楼上正解我会乱说？