1, You ought to go to the dentist's immediately (BETTER)

-> You'd better go to the dentist's immediately

2, It's good thing you brought your cheque book or we wouldn't have been able to buy the car (YOU)

->If you hadn't brought your cheque book , we wouldn't have been able to buy the car.

Kiến thức :

1. S ought to V = S had better +V : ai đó nên lmj

2.Câu điều kiện loại 3 : If S had + P2 , S would have P2

1. You had better go to the dentist's immediately.

(ought to do sth= had better do sth: nên làm gì)

2. If you hadn't brought your cheque book, we wouldn't have been able to buy the car.

(Câu điều kiện loại 3: diễn tả sự việc trái với quá khứ:

If + S1+ had+ PII, S2+ would + have+ PII)