问题描述：
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：
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：
问题解答：
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