a) Some body has taken my briefcase.
=> My briefcase has been taken.
b) She has finished her report soon.
=> The report has been finished by noon.
c) The mad dog bit the little boy
=> The little boy was bitten by the mad dog.
d) They didn’t allow Tom to take these books home.
=> Tom wasn't allowed to take these books home.
e) This is the second time they have writteb to us about this.
=> This is the second time we have been written to about this
f) They didn’t look after the children properly
=> The children weren't looked after properly.