=>
III/
1. To use 
2. To give 
3. Working 
4. To improve 
5. To get 
6. Taking 
7. Relaxing 
8. Working 
9. To be
10. To take 
11. Working 
12. Learning 
13. To take 
14. Helping 
15. Playing 
16. Not to cry 
17. Operating 
18. To bring 
19. To switch off 
20. To use 
IV/
1. I haven't seen him for three years. 
2. I haven't visited my grandmother for two years. 
3. He hasn't written to his sister for ten months. 
4. My father hasn't played tennis for half a month. 
5. She hasn't seen her husband for four years. 
6. I haven't eaten fish for ten years. 
7. We haven't had dinner at that restaurant for five months. 
8. My grandmother hasn't told me a folktale for six years. 
9. I haven't written to Mary for seven years. 
10. Mr. Green hasn't drunk coffee for two days. 

1. To use 
2. To give 
3. Working 
4. To improve 
5. To get 
6. Taking 
7. Relaxing 
8. Working 
9. To be
10. To take 
11. Working 
12. Learning 
13. To take 
14. Helping 
15. Playing 
16. Not to cry 
17. Operating 
18. To bring 
19. To switch off 
20. To use 
IV/
1. ... seen him for three years. 
2. .. visited my grandmother for two years. 
3. .... written to his sister for ten months. 
4. .... played tennis for half a month. 
5. . seen her husband for four years. 
6. .... fish for ten years. 
7. .. had dinner at that restaurant for five months. 
8. ..... told me a folktale for six years. 
9. ..... written to Mary for seven years. 
10. ..... drunk coffee for two days.