1. If I know, I will tell you.
2. If she wants to talk she will ring up.
3. Her health will improve if she sleeps longer.
4. If he has enough money, he will buy a large house.
5. She will feel lonely if Peter goes out every evening.
6. We will be pleased to see you if you arrive.
7. If we can come on Sunday, we will come.
8. I will understand Mr. Smith if he speaks slowly.
9. We will not go by ship unless there are no other way.
10. If you don't give him good meals, he won't be able to work hard.
1. If she had tired, she could have been better.
2. He would have done more work if he had been able.
3. I should have lived better if I had earned more money.
4. If I had known the answer, I should have told you.
5. He wouldn't have come unless you had invited him.
6. We shouldn't have remembered it if it hadn't been so strange.
7. If I had had time, I would have helped you.
8. Peter would have come if you had wanted him to.
10. If you had written more often, you would have received more letters.
11. They would have prefered to keep it if they could.
12. I would have bought it by myself if I had had money.
13. If they had offered it to me for nothing, I wouldn't have taken it.
14. I should have broken a promise if I had answered your question.
15. If you had sworn to keep a secret, I would have told you.