1. If you don't keep silent, you'll wake the baby up.
2. If you don't hurry up, you will be late.
3. If you don't leave me alone, i will call the police
4. If you tell lies to your boss, you'll be fired at once.
5. If I knew her number, i would ring her up.
6. If i knew the answer, i could tell you
7. IF today were sunday, the pupils could go swimming
8. If it didn't rain, the match couldn't be cancelled