1.I'm afraid I have forgotten my book at home.
2 has the Secretary came yet?
3. have you ever been to Italy?
4. they have already informed me about the accident
5. Kevin has already left for Moscow
6. he hasn't received any letters from her this week.
7. I haven't heard from him since he left.
8.I haven't seen Tom for 5years.
9. have you had a holiday this year?
10.we have seen some good films recently.
11.they have waited for you for half an hour.
12. Mom has had a headache since she came from the theatre.
13. Alan has worked in the bank for a year.
14.Granny has been I'll for a week.
15.have you ever ridden a horse?
16. he has already done this experiment.
17. he has just passed the exam
18. have you ever read this book?
19. the article has just translated by the students..
20. the scientific conference hasn't start yet.
