| | rhetorical questions (with question tags)
I would appreciate if someone could give me some information about this kind of question. I've come across with question tags like these ones:
Oh, so he paid you back at last, did he?
So we're meeting at 9, are we?
But I can't find a gramatical explanation in my grammar books or on the Internet. The only grammar explanation I've found so far it's that when the first part of the question is positive, the second part is negative and viceversa.
My question is: We use a question tag (positive clause, positive clause) only when we want to ask a rhetorical question? If so, can we use as well a negative clause with another negative clause? e.g. So he didn't pay you back, didn't he?
Thank you in advanced.