1. I have just told you the answer.
2. I told you the answer yesterday.
3. John and Richard have just left.
4. She has already replied to the letter.
5. She replied to him on Tuesday.
6. John and David left five minutes ago.
7. I read this book in the summer holidays.
8. I read the telegram hour ago.
9. He has not smoked for two weeks. He has been trying to quit smoking.
10. Did you lock the door?
11. I can not go out because I have not finished the job.
12. He has written a letter but can not find a stamp.
13. Here are your shoes. I have just polished them.
14. I left the house at 8 and arrived here in 12.
15. Have you been here before? - Yes, I spent a holiday here last year.
16. Have you heard? Suzanne has got married.
17. I've never played golf.
18. He smoked twenty cigarettes today.
19. Tom lost the key yesterday.
20. Did you see this movie on TV yesterday?