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 I knew, I would tell you.
2) If she wanted to talk, she would ring up.
3) Her health would improve if she slept longer.
4) If he had enough money, he would buy a large house.
5) She would feel lonely if Peter went out every evening.
6) We would be pleased to see you if you arrived. 
7) If we could come on Sunday, we would come.
8) I would understand Mr. Smith if he spoke slowly.
9) We wouldn't go by ship unless there was no other way.
10)If you didn't give him good meals, he wouldn't be able to work hard.