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C/
1. I have studied French for many years, so my French-speaking friends can chat easily with me now.
2. You are quite intelligent, but you don't think before you act.
3. My friends Jane and Jenifer have just moved into a new home and they've made many changes in its apearance.
4. Sue could study music or drama next year.
5. Tom watches the news, but Bill makes news.

II/
1. He invited me to come on a picnic with them.
2. He asked me not to tell anybody what had happened.
3. He threatened to resign if I didn't give him a pay rise.
4. He asked me if he could borrow my pencil.
5. He promised to finish the work by the end of that week.
6. He advised Andrew to take a break.
7. He reminded me not to forget to go to the supermarket after work.
8. He warned me to stay away from him.
9. He volunteered to drive me to the airport.
10. He suggested singing a few songs.

11. They made me study hard when I was at school.
12. Sally encouraged Jack to apply for the job.
13. Why don't you try to use honey instead of sugar?
14. Don't put off going to the dentist.
15. I am going to the post office in order to send some letters.
16. My grandfather is too weak for him to lift the box.
17. It was very stupid that she went out without a raincoat.
18. The lesson wasn't short enough for us to learn by heart.
19. Mary told John not to tell anyone her new address.
20. Would you please to make me some tea?