QUESTION TAGS - some special cases:

I am right, aren't I?	aren't I (not amn't I)
You have to go, don't you?	you (do) have to go...
I have been answering, haven't I?	use first auxiliary
Nothing came in the post, did it?	treat statements with nothing, nobody etc like negative statements
Let's go, shall we?	let's = let us
He'd better do it, hadn't he?	he had better (no auxiliary)

Have + got:

You haven't got $10 to lend me, have you?

Question tags with imperatives

Sometimes we use question tags with imperatives (invitations, orders), but the sentence remains an imperative and does not require a direct answer. We use won't for invitations. We use can, can't, will, would for orders.

	imperative + question tag	notes:
invitation	Take a seat, won't you?	polite
order	Help me, can you?	quite friendly
	Help me, can't you?	quite friendly (some irritation?)
	Close the door, would you?	quite polite
	Do it now, will you?	less polite
	Don't forget, will you?	with negative imperatives only will is possible

Same-way question tags

Although the basic structure of tag questions is positive-negative or negative-positive, it is sometime possible to use a positive-positive or negative-negative structure. We use same-way question tags to express interest, surprise, anger etc, and not to make real questions.

So you're having a baby, are you? That's wonderful!
She wants to marry him, does she? Some chance!
So you think that's amusing, do you? Think again.

Negative-negative tag questions usually sound rather hostile:

So you don't like my looks, don't you?