The birds can fly, can not they?- Yes, they can
Your favourite subject is Mathematics? is not it?- Yes, it is./No, it is not.
My sister is reading a book now, is not she? - Yes, she is//No, she is not.
This autumn is not cold, is it?- Yes,it is/ No, it is not.
We must do our homework every day, must not we?- Yes, we must./ No, we must not.