Express the same using passive:
You can't devour such books.
They must translate the speech when the time comes.
People push the door to open it.
Somebody bought a bronze candlestick and three green candles.

1)such books can't be devoured by  you.
2)the speech must  be translated by the scheduled time.
3)Door was pushed by people to  have it open.
4)candlestick and three green candles have been bought by someone.

  я не уверенна в  100% правильности!