“TOM must have goodhibits.TOM是第三人称,为什么不能用“has”而用“h

网友回答

must是情态动词接原型,其他如may might can could should shall 等都是情态动词
======以下答案可供参考======
供参考答案1:
must是情态动词 后面必须用原形
诸如should \can
供参考答案2:
must = have to, 后面加原形动词
供参考答案3:
因为前面有个 must,当动词前有 must, can 等的助动词时均要用动词原形,
must do sth.明白吗?
供参考答案4:
must后面用动词原形