1. If he speaks English fluently, he will succeed in the interview
2. If it had not been for the teacher's explanation , we would not have understood
3. If he had not drunk a lot of beer last night, he would not have been tired now. ( if ko có thực ở quá khứ luôn)
4. Should Tom come, he will have chance to meet the girl.
KO hiểu thì hỏi mình nha !! ^^ luôn sẵn sàng!