She must be in her room,________?改成反意疑问句．并解释一下这样改的原因．

Key:isn't she?must与 be 连用,表示猜测、推测,在使用中要注意这个情态动词短语的两个方面.1、反意疑问句：主语 must be...,be not 主语（代词）?类似的用法还有may be.eg.They must be late,aren't they?It may be ...