6. A hamburger has been eaten by me.
7. The present has been opened by me.
8. The book has not been read by them.
9. The parcel has not been sent by you.
10. By Monday, the information had been received by the delegates.
11. His homework had been finished before she came.
12. The passage had been written by them.
13. Trees had been planted by them.
14. He had been told of the meeting by them.
15. A fight had been started by them.
16. The window had not been closed by me.
17. The paper had not been bought by them.
18. Had the problem been solved by her?
19. These pencil cases have been bought by Nina.
20. The reports have been written by him.
21. This film has been seen before by Tom.
22. The newspaper has been read by Nina.
23. These movies have not been seen yet by them.
24. The contract has been signed by me.
25. The tickets have been bought by these men.