1. I haven't eaten today yet.
3. You didn't play the piano yesterday.
4. Have you played the piano today?
5. What have you prepared for today?
6. Mike has made it himself. He made it last Sunday.
7. Where have you put my pen?
8. Have you seen Mary today?
9. When did you see Mary? - I saw her last week.
10. Did your mother promise to take you to the theatre?
11. I've made it myself.
12. he's fallen ill. - When did he fall ill? - He fell ill yesterday.
13. I've already done my homework.
14. I did my homework yesterday.
15. He's just come home.
16. He came home a minute ago.
17. Nick played football yesterday.
18. She has already come from school.
19. I read this book last year.
20. I've read this book this year.
21. I've never been to Washington.
22. Have you ever been to New York?
23. Have you ever see the eruption of a volcano?