Has anyone mended that chair yet?
⇒ Has that chair been mended yet ?
I told him to write to the adress
⇒ I told him that the address to be written.
Somebody has locked the box and I cannot open it
⇒ The box has been looked and I can't open it.
Is Mr.Jones going to give a lecture next week?
⇒ Is a lecture going to be given by Mr.Jones next week.
When I visited their house, they had clean everything.
⇒ When I visited their house, everything had been cleaned.