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My father must be in his office -------(反意疑问句)

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My father must be in his office -------(反意疑问句)
the book is mine 同义句
the book()()()
My father must be in his office,isn't he?
must 的反意疑问句规则较多,本句中must表示猜测“一定,肯定”,反意疑问句的附加谓语不用must和need,而是在意义上和陈述句中谓语动词的时态保持一致,即must之后的动词be.类似的例如:He must be from the south,isn‘t he?他肯定是南方人,是不是?
补充的问题:
the book is mine 同义可改为:
the book belongs to me.