反意疑问句 He must be a worker,_______

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反意疑问句 He must be a worker,_______
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反意疑问句 He must be a worker,_______
反意疑问句 He must be a worker,_______

反意疑问句 He must be a worker,_______
答案：isn't he?
原因分析：（参考已有网友的语法要点总结）
当陈述句部分有情态动词must时,反意疑问部分有四种情况：
① 若must表示“必须”或“有必要”,疑问部分用 mustn’t 或needn’t：
You must leave at once,mustn’t [needn’t] you?你必须(有必要)马上离开,是吗?
但是若陈述部分有mustn’t表示禁止,疑问部分要must：
You mustn’t laugh,must you?你不准笑,知道吗?
② 若must表示推测,疑问部分不能用must,而应根据must后的动词结构采用相应的动词形式：
He must be tired,isn’t he?他一定累了,是吗?
③　当must用来表示对现在的情况进行“推测”时,反意疑问部分要根据must后面的动词采用相应的形式.
例：He must be good at maths,isn’t he?他数学一定学得很好,是吗?
④　当must用来表示对过去的情况进行“推测”（must + have done）时,如强调对过去情况的推测（一般句中有过去的时间状语）,反意疑问句部分要用“didn’t + 主语”；如果强调动作的完成（一般没有过去时间状语）,反意疑问句部分要用“haven’t / hasn’t + 主语”.
例：She must have read the novel last week,didn’t she?她上星期一定读了这本小说了,是吗?
You must have told her about it,haven’t you?你一定把这事告诉她了,是吗?

isn't he

isn't he?

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