We can use tag questions in speaking, and sometimes in writing, at the end of a sentence. We use only the first auxiliary verb -- the same as with short answers (Lesson 11).
He was on the team last year, wasn't he?
She has been swimming, hasn't she?
We should have left earlier, shouldn't we?
You like rock music, don't you? (NOT liken't you?)
He studies hard, doesn't he?
They went yesterday, didn't they?
John is not an accountant, is he?
You don't like classical music, do you? NOT like you?
She hasn't been playing tennis, has she?
The students couldn't do the test, could they?
You play football, don't you?
John doesn't like milk, does he?
It's a lovely day, isn't it? (I want you to agree.)
You're a mechanic, aren't you? (I want help with my car.)
You don't play football, do you? (I have just learnt that you play football, but this surprises me).