1.If the earth suddenly stopped spinning, we would all fly away from it

2.If you smoke in a non-smoking compartment, the other passengers will object.

3.Wouldn't your parents be proud if they could see you now?

4. I'm broke, but I would have plenty of money now if I didn't spend so much yesterday.

5. If we worked all right, we could finish in time, but we have no intention of doing it 

6.If we had a submarine now, we would use it to investigate the seabed

7.Were he 10 years younger, he would take part in the voyage around the world.

8.Should you come later, they won't let you in.

9.He might get rid of his cough if he didn't smoke so much

10.If someone gave you a boat, what would you do? 

11.Water will freeze if the temperature falls below zero.