Ответ:
1. Too bad they lost.
2. If he did not know French, he would not have translated this story.
3. She said that if it were simple, she would do everything now.
4. It is a pity that you threw the letter away.
5. It is a pity that she did not read this book.
6. If he lived close to me, I would have visited him a long time ago.
7. It is a pity that you were angry with me.
8. If not for his help, I would be late now.
9. If he had not been in a bad mood today, he would not have been so rude.
10. I would like you to repeat all the rules for the exam.
11. It is a pity that I have to get up so early every day.
12. It is a pity that you did not invite him to join the tour.
13. If not for his advice, I would not know what to do then.
14. If it were not for the frost, it would be possible to ski.
15. I would have met him yesterday if I had not been late at work.
16. Where would you go last summer if you had the opportunity?
17. What would you do if you were the principal?