1. If I see
John, I will tell him your news. 2. He was very pleased if it is
really true. 3. If you go to town on Monday, you will meet my brother Tom.
4. If you  need help, my father will help you. 5. We will  have a picnic lunch
if the day is fine. 6. If you ask a policeman, he will tell you the
way. 7. I will finish the job tomorrow if I  can. 8. I won't  require
an umbrella if it doesn't  rain. 9. If she  thinks it over carefully, she
will form a clear opinion. 10. If they catches the bus now, they will arrive
at half past nine. 11. He  finds the answers if he will look at the back of
the book. 12. If you  want me to, I will come for a walk with you. 13. If
he  writes to her, she will answer at once. 14. If you  wait a few
moments, the waiter will bring your coffee. 15. He will lose weight if he 
stops eating too much. 16. If she is patient, I will try to explain. 17.
I will wear a purle tie only if I must. 18. If we  leaves at once, we
will catch the early train. 19. If he does that again, his father will
punish him. 20. If she drinks this medicine, she will feel much better.