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反义疑问句Nobodyknowswhereshelives,?Youmustdoyourhomeworkbyyourself,?Youmustn'ttouchthemachine,?分别填什么?原理是什么?

题目详情
反义疑问句
Nobody knows where she lives,__________?
You must do your homework by yourself,____________?
You mustn't touch the machine,______________?
分别填什么?原理是什么?
▼优质解答
答案和解析
Nobody knows where she lives,【do they】?
陈述句主语为everybody,nobody,anyone等时,疑问部分通常用they代替;陈述部分含有表示否定的词,疑问部分应该用肯定形式.
You must do your homework by yourself,【needn't you】?
must表必须时,疑问部分用needn't
You mustn't touch the machine,【must you】?
有mustn't表示禁止时,疑问部分用must