Помогите, пожалуйста, переделать предложения из активного залога в пассивный залог

The boy was laughed at by them This film will be shown on tv by them Tennis was being played by boys from four till five Have you been explained the rules of the game by anybody? The bridge is being built by them over the river The story has been forgotten by them The film will be spoken about by you at the lesson The interesting stories are being read by them now The problem was discussed by them two days ago When will these books be returned by them to the library?