1 The secret box was shown to us by somebody.
2 We were allowed some chocolates by somebody.
3 Laura was sent a letter by somebody. The letter was went to Laura by somebody.
4 We were given $20 by somebody. $20 were lent to us by somebody.
5 Our bills were paid by somebody.
6 A funny story was told to them by somebody. They were told a funny story by somebody.
7 We were asked 2 questions by somebody. 2 questions were asked to us by somebody.
8 I was offered a ticket for a concert by somebody. A ticket for a concert was offered to me by somebody.