You are never late, are you? -No, I am not./ Yes, I am.
You haven't got a pet, have you? - No, I haven't./ Yes I have.
You can't ski, can you? - No, I can't. / Yes I can.
You don't like milk, do you? - No, I don't. / Yes, I do.
You don't like sweets, do you? - No, I don't. / Yes, I do.
You haven't got friends, have you? - No, I haven't./ Yes I have.