Преобразуйте предложения из действительного залога в страдательный? 1) who wrote that novel? 2) we use these clothes only on special occasons 3. somebody switched on the light and opend the ddor 4. they will give you an answer in some days.

1)By whom was this novel written?  
2)  These clothes are used only on special occasions by us.
3) The light was switched on by somebody and the door was opened. 
4) An answer will be given to you by them in some days.