Chuyển các câu sau đây sang bị động: Some body has taken my briefcase

Chuyển các câu sau đây sang bị động : a) Some body has taken my briefcase. b) She has finished her report soon. c) The mad dog bit the little boy. d)They didn’t allow Tom to take these books home. e) This is the second time they have writteb to us about this. f) They didn’t look after the children properly