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Ourteacherdidwhatshecouldtoteachuswell为什么could后面不用动原?

题目详情
Our teacher did what she could to teach us well为什么could后面不用动原?
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答案和解析
could 如果单独作情态动词,则跟动词原形.这句话中 she could 是一个定语,修饰 what,而后面的 to teach us well是一个目的状语.这句话的结构:Our teacher did what (she could )to teach us well.其中she could 是...