If Jimmy were not lazy, he wouldn't often get bad marks.
If we had had a map, we wouldn't have got lost.
If we had had enough money, we would have gone on holiday.
If she had hurried, she wouldn't have missed the train.
If I had known she couldn't eat beef, I wouldn't have bought it.
Unless you leave a forwarding address, we won't be able to contact you.
Provided that you save some money, you will be able to buy a car.
If the boys had any matches, they could light the fire.
If the new car had not been so expensive, he would have bought it.
Supposing that you fail your driving test, would you take it again?
The captain told us that if that tanker broke up, there would be an oil slick all along the coast.
Unless you water these flowers, they will die soon.
If it had not been for his incompetence, they would not have failed.
If you had given me fair warning, I could have avoided that date.
If he had not been careless, we would have finished the work.