=>
1. If you turn off all the lights, you will not pay more money.
2. If you aren't careful, you may have an accident.
3. If you don't phone your parents, you will have a trouble.
4. If you stay here, you will feel safe.
5. If you don't pay electricity bill today, your electricity will be cut off.
6. If you do morning exercises regularly, your body will be fitter.
7. If you don't drive carefully, you may have an accident.
8. If we don't use less fossil fuel, they will be run out soon.
9. If it doesn't stop raining today, we may be faced with a serious flood.
Câu đk loại 1 : If S Vs/es, S will/may (not) V
Unless ~ If not