情态动词must
问题描述：
情态动词must
请判断,并说明理由：
Must she leave early?这句话可以这样问没错,但是我可以说成 “Does she must leave early?” 为什么?
答
不可以啊!
must是情态动词一般放在谓语动词的前面.但是若有助动词就放在助动词前面,(情态动词与助动词可以连用)就好像:
举个例:He must have been gone away.句中have been 是助动词；must是情态动词；不过这种情况只可以用于陈述句.在疑问句中情态动词是置于句首的.所以不可以有Does she must leave early?这种说法!