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1. If the road weren't icy, the accident couldn't happen. 

2. I wouldn't wet if I had an umbrella with me. 

3. If the weather weren't snowy, we would go to school. 

4. If Jack didn't help me, I wouldn't be able to move the table. 

5. If you fail to pay, they will cut off the electricity. 

6. Unless you drank too much coffee, you could sleep. 

7. If you press this button, the machine will stop.

8. Unless you keep silent, you'll wake the baby up. 

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

10. If Tom didn't have to earn his living, he could attend school. 

11. If the weather is fine tomorrow, we can have a picnic in the park 

12. Unless we use fewer cars, we will reduce pollution. 

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