6 The present perfect tense

A
1. cancelled, 2. catered, 3. taught, 4. worn, 5. delayed, 6. lent, 7. paid, 8. transferred, 9. delivered, 10. risen, 11. copied, 12. interpreted, 13. spent, 14. chosen, 15. developed, 16. omitted.

B

1. have cancelled

2. have exceeded

3. have profited

4. have paid

5. has applied

6. have escaped

7. has gone bankrupt

8. has passed

9. have merged

10. has increased

C
1. sent, 2. met, 3. have not sold, 4. married, 5. heard, 6. have never seen, 7. booked, 8. have just received, 9. have cut.

D
1. have imported, 2. fired, 3. has been, 4. have lived/have been living, 5. built, 6. have been playing, 7. moved, 8. became, 9. have been trying, 10. has been.

E

1. we have imported/have been importing

2. have known

3. worked

4. have sold/have been selling

5. has worked/has been working

6. made; have not yet replied

7. have never seen

8. fell

9. I have been working

10. have gone up/have been going up

11. has worked/has been working

12. has been

13. has just left

14. I have broken

15. am getting; I have been playing

16. have you played/have you been playing; I have played/have neen playing; started

17. moved; has been

18. have been waiting

19. had

20. have been trying

21. has been rising

22. increased

23. passed

24. has been

25. has been

F
1. for, 2. since, 3. for, 4. for.

G

1. has been dead: The present perfect must be used when something began in the past and continues in the present.

2. died: The past tense must be used because there is an indication of past time in the sentence (some years ago).

3. has been staying: The present perfect must be used when something began in the past and continues in the present.

4. for three days: :. For refers to a whole period. (Since refers to the beginning of a period.)

5. worked: The past tense must be used because there is an indication of past time in the sentence (before we were married).

6. correct

7. have just returned: with just the present perfect is used.

8. have been increasing: The present perfect must be used when something began in the past and continues in the present.

9. correct

10. have had: The present perfect must be used when something began in the past and continues in the present.

11. correct

12. correct

13. has worked/has been working: The present perfect must be used when something began in the past and continues in the present.

14. I have been looking: The present perfect must be used when something began in the past and continues in the present.

15. Since they met: The past tense must be used because there is an indication of past time in the sentence. In this sentence the context (school) functions as an indication of past time. they have been friends: The present perfect must be used when something <emphasis role="double">began in the past</emphasis> and continues in the present</emphasis>.

H
1. increased, 2. has provided

I
1. have tried/have been trying, 2. have been, 3. has sold/has been selling, 4. has forced/forced, 5. has grown/has been growing, 6. announced, 7. will merge, 8. are, 9. have been, 10. innovated.