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He must have been here yesterday,( 改为反义疑问句

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He must have been here yesterday,( 改为反义疑问句
为什么
He must have been here yesterday,( 改为反义疑问句
He must have been here yesterday,( )? 改为反义疑问句
He must have been here yesterday, didn't he?
因为 must +完成形式have been here yesterday表推测,意思是:“你昨天一定来过这里”.又因为是时间是【昨天】,是过去时,所以反义疑问部分,应该是didn't he?
再问: 可是答案是wasn't he
再答: 不好意思。 He must have been here yesterday, wasn't he? 因为 must +完成形式have been here yesterday表推测,意思是:“你昨天一定来过这里”。又因为是时间是【昨天】,是过去时,谓语动词是be,所以反义疑问部分要用be的过去形式,应该是wasn't he?