When to use tag questions?

We use tag questions, Ahmad, to check information or to ask for agreement. If we use a rising intonation in the tag, we do not know or are not quite sure of the answer. If we use a falling intonation in the tag, we are seeking the agreement of the person we are talking to.

We can reply to tag questions either with simple yes/no answers (negative tags normally expect a yes answer and positive tags normally expect a no answer) or by using yes/no + auxiliary verb.

In these examples, use a rising intonation in the tag. It is a genuine question. You are not sure what the answer will be.

You haven't seen my tennis shoes, have you? ~ No, I'm sorry. I haven't.

I couldn't borrow yours by any chance, could I? ~ No. They wouldn't fit you.
In these examples, use a falling intonation in the tag. You are simply seeking agreement.

It's been a lovely day today, hasn't it? ~ Yes, it has. Gorgeous.

It was a lovely wedding, wasn't it? ~ Wonderful!

I thought Sue looking stunning in her wedding dress, didn't she? ~ Yes, she did. Absolutely stunning.

It's a shame the day is over, isn't it? ~ Yes, it is.