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  1. #1
    joham is offline Key Member
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    He must have seen it, mustn't he?

    English Lessons - Grammar

    In the above link we can see such a sentence:

    He must have seen it, mustn't he?

    This is the first time I have seen such a question tag as with 'must have done'. In China's English tests or examinations, such a tag is thought to be absolutely wrong. They say we must use 'hasn't he?'. They also say we must say 'He must have seen it yesterday, didn't he?'

    I thought 'mustn't he?' was fine, but I had never found any proof. Now that I've got this sentence, I'd like to know how authoritative it is and whether we can use this sentence at all.

    Might I ask native English teachers to help me clarify this puzzle of mine?

    Thank you very much.

  2. #2
    BobK's Avatar
    BobK is offline Harmless drudge
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    Re: He must have seen it, mustn't he?

    Quote Originally Posted by joham View Post
    ...
    He must have seen it, mustn't he?
    There's nothing wrong with this. Any other tag question implies an ellipsis such as 'He must have done it. [Tell me I'm not wrong. (Beginning to be unsure) He did...] Didn't he?'. In that case, it's not really a tag question at all, as it's not asking for routine confirmation of a certainty.

    b
    Last edited by BobK; 20-Mar-2008 at 12:25. Reason: Added, to clarify implied ellipsis

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