Ответ: 1. If I (saw) John , I ( would tell) him your news. 2. If you (went) to town on Monday, you (would meet) my brother Tom. 3. If you (needed) help, my father (would help) you. 4. We (would have) a picnic lunch if the day (were) fine. 5. If you (tasked) a policeman, he (would tell) you the way. 6. I (would finish) the job tomorrow if I ( could). 7. If they  caught) the bus now, they (would arrive) at half past nine. 8. He (would find) the answers if he  looked) at the back of the book. 9. If you (wanted) me to, I (would come) for a walk with you. 10.If he ( wrote) to her,she (would answer) at once.