童鞋,首先纠正一下 she don't know 是一个错误句式,she doesn't know是正确的.
其次助动词以及实义动词的第三人称单数形式变化是这样的,当助动词、实义动词的主语是第三人称单数时,动词也要相应的变为三单形式
最后,动词三单基本变化是在词尾加 s 比如 she likes...he says...
特殊变化 do -does go-goes
she后面什么时候加does什么时候用do?例如she don't know,she doesn't know
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