The clip we heard came from an episode of Real Easy English about teachers - listen to the whole programme.

We are studying English, aren't we? Yes, we are. This is a conversation English course, isn't it? No, it's a business English course. Tag questions are useful for negotiations, aren't they? Yes ...

Question tags can either have a rising or falling intonation depending if you want to genuinely ask for the answer or expect someone to agree with you.

We usually ask a question when we want someone to tell us something. In other words, we expect an answer when we ask a question. But tag questions are a bit different.