练习题：

1. I _____ (study) English for five years.

2. She _____ (not finish) her homework yet.

3. We _____ (already eat) dinner.

4. They _____ (just arrive) at the airport.

5. He _____ (never be) to China.

6. I _____ (live) in this city for ten years.

7. She _____ (work) in the same company for fifteen years.

8. We _____ (already see) that movie.

9. They _____ (just finish) their project.

10. He _____ (never try) sushi.

答案：

1. have studied

2. hasn't finished

3. have already eaten

4. have just arrived

5. has never been

6. have lived

7. has worked

8. have already seen

9. have just finished

10. has never tried