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

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

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

4. If Jack hadn't helped me, I wouldn't have been able to move the table.

5. If they didn't fail to pay, they woudn't cut off the electricity.

6. Unless you drink too much coffee, you can't sleep.

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

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

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

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

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

12. Unless we don't use fewer cars, we will reduce pollution.