关于must的反意疑问句She must have been there for a long time,____ __
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是的,你的理解是正确的.反意疑问句部分既可以用hasn't she,也可以用didn't she?下面是这个语法的一个小结,希望帮助你更好地理解.1.当陈述句谓语动词是:must+have+done时,如果是对过去某种情况的推测,且句中有过去的时间状语时,反意疑问句根据动词用:didn't/wasn't/weren't+主语.eg.:(1)You must have read the story last term,didn't you?(2)He must have met her yesterday,didn't he?2.当陈述句谓语动词是:must+have+done(过去分词)时,如果只是强调动作的完成情况,反意疑问句用:haven't/hasn't+主语.eg.:(1)She must have arrived there,hasn't she?(2)You must have seen the film,haven't you?3.当陈述句谓语动词是:must+do(动词原形)时,是最为复杂的,看下面的例句:(1)You must see the doctor,needn't you?表示“(主观上)必须”,其疑问部分用needn't（不必）,如：We must go at once,needn't we?我们必须立刻走,是吗?(2)You mustn't do that again,must you?表示“应该/不应该”或"禁止",其疑问部分用mustn't（不应该）/must(应该),如：You must work hard next term,mustn't you 下学期你应该努力学习,对吗?陈述部分含情态动词mustn't,表示禁止时,附加疑问部分就可以用must或may,如：We mustn't be late,must we?(may we?) 我们不可以迟到,是吗?(3)The food must be nice ,isn't it?表示推测,其疑问部分必须与must 后面的主要动词相呼应.如：1）对现在动作或存在的情况的推测：You must know the answer to the exercise ,don't you?你一定知道这项练习的答案,是不是?That must be your bed,isn't it?那一定是你的床,是吗?总结:1.陈述部分有must,且表示"必须"时,附加疑问句部分用mustn't.2.如果表示"必要"则用needn't.3.陈述部分中是mustn't表示"禁止"时,附加疑问句部分用must.4.陈述部分中的must表示"一定"、"想必"等推测意义时,附加疑问句部分是根据陈述部分的谓语动词或其助动词来定.

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