1. If you don't keep silent, you will wake the baby up

2. If you don't stop talking, you won't understand the lesson.

3. If I knew her number, I would ring her up

4. If I knew the answer, I would tell you.

5. If we had had the map, we wouldn't have got lost.

6. If Susan hadn't eaten four cream cakes, she wouldn't have felt sick.

7. If it hadn't been for this treatment. the patient would have died.

8. If he hadn't been late every day, he wouldn't have lost his job.

9. If Peter didn't eat so many chips, he wouldn't be fat.

10. If Robert hadn't smoked, he wouldn't have got a bad cough. 

Vì ta có 3 loại điều kiện :

1: [If + thì hiện tại đơn], [will + động từ nguyên mẫu]

2: [If + thì quá khứ đơn], [would + động từ nguyên mẫu]

3: [If + thì quá khứ hoàn thành], [would + have + V3/V-ed]