I
1. Peter brother doesn't run as fast as him
2. If we don't keep our environment, we won't enjoy a healthy life
3. Although I enjoyed the holiday, I was glad to be back home
4. The taxi driver who took me to theairport was friendly and hospitable
5. If I had the key, I could get into the house
6. Beause of his sickness, he didn' go to work yesterday
7. Even though my grandfather is old, he cycles 10 kilometers every morning
8. I want to see the painting which you bought yesterday

II
1. we haven't cleaned our room for a week
2. If you speak slowly, he ccan understnd what you mean
3. We could go to the beach if I were free today
4. Jane's sister doesn't cook as well as her
5. Because he was lazy, he failed the exam hast month
6.Her voice is too impissible for me to hear it
7. It took him am hour to water the flowers yesterday
8. I types less carefullly than Anna
9. Everthing used to be written by hand
10. The last time she phoned me was three months ago