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 will know what she is saying

6. If you stay here, you will feel safe

7. If you pay electricity bill today, your electricity will not be cut off

8. If you stop smoking, your cough may not be worse

9. If we use less fossil fuel, they will not be run out soon

10. If it doesn't stop raining today, we may be faced with a serious flood.