Answers:

  Exercise III:    

     1. I has tried to learn French for years, but I haven't succeded yet.

     2. She has read all the works of Dickens. How many has you read?

     3. I have waiting here nearly half an hour for my girlfriend; do you think she has forget to come?

     4. Mary rest in the garden all day because she was ill.

     5. Although John has studied at the University for 5 years, he hasn't gotten his degree yet.

     6. Jack went to Switzerland for a holiday. He has never been there.

     7. We lived here for the last six months, and have just decied to move.

     8. That book has lieing on the table for weeks. You didn't read it yet?

     9. He hasn't been here since Christmas; I wonder where he has lived since then.

     10. He has lost his books. He has looked for them all afternoon, but they haven't turned up yet.

     11. She has worked so hard this week that she doesn't have time to go to the cinema. 12. Your hair is wet. Have you swim for a long time?

     13. Bill is still a bad driver although he has driven cars for six years.

     14. You look very tired. Have you worked very hard ?

     15. The phone has been ringing for 2 minutes, but I haven't answered it yet.

1. have been trying-haven't succeeded

2. has read-have you read

3. have been waiting-has forgotten

4. has been resting-has been

5. has been studying-hasn't gotten 

6. has gone-has never been

7. have been living-have just decided

8. has been lying-haven't read

9. hasn't been-has been living

10. has lost- has been looking-haven't turn up 

11. has been working-hasn't had

12. Have you been swimming

13. has been driving

14. Have you been working

15. has been ringing-haven't answered

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