1.
If I had known about the film, I would have watched it. 2. If she didn’t
call me, I would not know about your arrival. 3. If he had let me know
about the meeting yesterday, I would have come. 4. If I were you, I would have
seen them off. 5. You wouldn’t have had so many accidents if you had driven
more carefully. 6. If mum had been in, she would have answered the phone. 8. If you passed your examination, I would give you a present. 9. I wouldn’t have
taken the dictionary home if I had known that it was the only one you had.
10. If he knew that the road was dangerous he would not drive. 11. I would
have helped them if I were you. 12. He would be the best student in the
group if he worked harder.