1. If I don't buy a new hat, I will not  give it to you

2. If today were not sunday, the pupils could not go swimming

3. If he had not been here, he would not have had a lot of fun

4. If my brother does not enough money, he will not buy a bicycle

5. If he had not had enough time, he would not have read this novel

6. If she had not missed  the bus, she wouldn't have been late

7. If  Peter doesn't study hard, he  could not have good marks

8. If  my sister had  a terrible headache, she would be absent from her  class

9. If  Windy had came, we would not have cancelled this the meeting

10.If he hadn't been angry, he would have said anything.

Loại 1

If + hiện tại đơn , S + will/can/may + V + ..

Loại 2

If + quá khứ đơn , S + would / might / could + V + ..

Loại 3

If + quá khứ hoàn thành , S + would + have + `V_{II}`

1. If I buy a new hat, I will give it to you

2. If today were sunday, the pupils could go swimming

3. If he had been here, he would have had a lot of fun

4. If my brother has enough money, he will buy a bicycle

5. If he had had enough time, he would have read this novel

6. If she had not missed  the bus, she wouldn't have been late

7. If  Peter studies hard, he  could have good marks

8. If  my sister didn't have  a terrible headache, she would not be absent from her  class

9. If  Windy had came, we would not have cancelled this the meeting

10. If he hadn't been angry, he wouldn't have said anything.

=> câu điều kiện loại 1

=> If + S + Verb (thì hiện tại), S + will (can, may) + Verb (nguyên mẫu)