题目内容：

情态动词could与must表推测时反意疑问句一样吗.
He must be at home,isn't he 但He could be at home还是He could be at home ,isn't he 若句中不是be而是实义动词呢,试例子：

优质解答

对,一样的.
如果是实义动词,就根据那个动词来,比如He must have lost it yesterday, didn't he?
反正你记住,只要是情态动词表示推断,反义疑问句都不能直接用情态动词,而是要还原到实义动词.