1) If I see you, I will give you a present.
2) If I know her telephone number, I will give it for you.
3) If I knew his telephone number, I would give it for you.
4) If I were president, I would buy a plane.
5) I could teach you, If I were teacher.
6) If I had a lot of money, I could buy a car.
7) If I were you, I would see a teacher.

Công thức 

If loại I: If + $S_{1}$ + $V_{(s/es)}$, $S_{2}$ + will/can/shall... + V.

If loại II: If + $S_{1}$ + $V_{(2/ed)}$, $S_{2}$ + would/could/should... + V.

Lưu ý: Be được chia thành Were cho tất cả các ngôi.

=>

1. will give

2. will give

3. knew

4. would buy

5. were

6. had

7.  were