1. If you turn off the lights, you won't pay more money.
2. If she doesn't wear warm clothes, she will have a cold.
3. If you aren't careful, you may have an accident.
4. If you don't phone your parents, you will have a trouble.
5. If she doesn't whisper, everyone won't know what she is saying.
6, If you stay here, you will feel safe.
7. If you don't pay electricity bill today, your electricity will be cut off.
8. If you don't stop smoking, your cough may be worse.
9. If we don't use less fossil fuel, they will be run out soon.
10. If it doesn't stop raining today, we may be faced with a seriois flood.
11. If you do morning exercise regularly, your body will be fitter.
12. If we don't renewable energy, we will have nothing for the future generation.
13. If we don't reduce the use of non-renewable energy, the climate will change.
14. If you lock all the doors, no one can break into your house.
15. If we continue continue hunting polar bears, they won't become extinct in near future.