If people ______(drive) more slowly, there wouldn’t be so many accidents. 2. If you had worked carefully, you _____(not make) so many mistakes. 3. The boat wouldn’t have drifted away, if we _____ (tie) it up. 4. If I had known you already _____(have) a typewriter, I _____(not, buy) one for your birthday. 5. If he _____(be) here this afternoon I would go with him. 6. If it were to rain tomorrow, the match _____(postpone). 7. But for your help, we ______(not be) able to finish the work in time. 8. If it _____(not, be) for the leadership of the Party, we would not have achieved so much. 9. I wish I _____(study) hard while I was young. 10. It is about time that fence ______(mend). 11. My request is that we ______(hold) another session to discuss the problem. 12. It is strange that the car _____(break) down at exactly the same place where it _____(break) down yesterday. 13. The baby smiled as if he _____(understand) what his mother _____(say). 14. He talked as if he _____(do) all the work himself, but in fact Tom and I _____(do) most of it. 15. If only we _____(have) a phone! I’m tired of queuing outside the public phone box.