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Possible Duplicate:
Question tags — “did you” vs. “didn’t you”

Which one is correct?

option 1:

You have no idea, don't you?

or, option 2:

You have no idea, do you?

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marked as duplicate by FumbleFingers, Bill Franke, Kris, Matt E. Эллен, Robusto Dec 22 '12 at 15:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

(2) is correct and (1) is incorrect; Tag Formation requires an affirmative tag question after a negative declarative, however the negation is asserted. – John Lawler Dec 21 '12 at 19:04

The general principle is that when the main clause is positive, the question tag is negative. You have no idea is made negative by the presence of no. It follows that the tag will be do you?

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In general "do you" since the first part of the sentence is negative (contains "no"). But sometimes natives use it wrongly "negative + negative" to highlight that situation is absolutely clear and there is no choice in the question.

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