1. The bill has been paid by Nancy.
2. A hamburger have been eaten by me.
3. The present has been opened by me.
4. The cats had been fed by Ann.
5. The book hasn't been read.
6. The letter haven't been sent.
7. The thieves haven't been caught.
8. Our homework has been done.
9. My friend's email has been written for 2 hours.
10. Their work had been finished.
11. The English grammar has been explained by our teachers.
:)
