The teacher has told a story

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9. The teacher has told a story
10. Somebody has taken my books away.
11. Somebody takes my books away.
12. Somebody took my books away.
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13. They clean the wall before they paint it.
14. They cleaned the wall before they painted it.
15. Mr. Cole visited John at the weekend.
16. Mr. Cole usually visits John at the weekend.
17. Mr. Cole has visited John many times
18. Science and technology have completely changed hu
19. They found the book on the floor
20. They find the books in the desk
21. They have found the keys in the drawer
22. They don't finish the work in time
23. Do You finish the work in time ?
24. Did You finish the work in time ?
25. You finish the work in time