Active : The boy was throwing the stone.
Passive : The stone was being thrown by the boy.
Active : What was he writing on the desk?
Passive : What was being written by him on the desk?
Active : Was the suspect dragging you?
Passive : Were you being dragged by the suspect?
Active : Nobody was watching TV.
Passive : The TV wasn't being watched (by anybody).
Punto 2Active : They have cleaned the clinic.
Passive : The clinic has been cleaned by them.
Active : Thomas has written many books.
Passive : Many books have been written by Thomas.
Active : Have the police caught the man?
Passive : Has the man been caught by the police?
Active : UPS has delivered the letters.
Passive : The letters have been delivered by UPS.
Punto 3Active : The brave men had defended the city.
Passive : The city had been defended by the brave men.
Active : The little girl had broken the window.
Passive : The window had been broken by the little girl.
Active : Had Dorothy solved the problems?
Passive : Had the problems been solved by Dorothy.
Active : Those prisoners had robbed five banks.
Passive : Five banks had been robbed by those prisoners.