must have been/have done : question tags?

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birgit33

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"She must have been there early, didn't she?" "You have done a lot of work, didn't you?" Are the question tags "didn't she?" and "didn't you?" correct?
 

SoothingDave

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Match the verb used earlier. You have done a lot of work, haven't you?
 

Raymott

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"She must have been there early, mustn't she?"
However, it's not common to use a question tag with "must". If you are confident enough to say that something "must have been", you don't usually express doubt with a question tag.
 
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