4. If David weren't so clumsy, he wouldn't have any accidents.
5. If I weren't so busy, I would write to my friends regularly.
6. If Sandra arrives a bit early, she can help you get things ready.
7. If the bus weren't so crowded, I would ride it to school every morning.
8. If the office wasn't closed, Mark would be able to get in.
9. If people realised how important it is to conserve energy, they would do many things about it.
10. If you want a chat, give me a ring.
11. If it weren't raining, we would finish the game.
12. If the driver in front hadn't stopped suddenly, the accident wouldn't have happened.
13. If the airport hadn't been closed, Sarah would have been able to fly to Rome.
14. If Carol hadn't been studying, she would have answered the phone.
