BIỂN ĐỔI THÀNH CÂU HỎI ĐUÔI:
7. Ought to Susan iron her clothes?
->Susan........................................
8. Can't Mike and Kathy lift that case?
->Mike and Kathy................................
9. Can't anything change her decision?
->Nothing.........................................
7.Susan should iron her clothes shouldn't she?
8.Mike and Kathy can't lift that case,can they?
9.Nothing can change her decision,can it?
7 should -> ought to