The author wrote a new book
A new book was written by the author
He will finish the report
The report will be finished by him
He will choose a new leader
A new leader will be chosen by him
She will teach the new curriculum
The new curriculum will be taught by her
He opens the door
The door is opened by him
The dog eats cow bones
Cow bones are eaten by the dog
The students are taking the test
The test is being taken by the students
They are cleaning the house
The house is being cleaned by them
The team won the championship
The championship was won by the team
The engineer designs the building.
The building is designed by the engineer
We are preparing the dinner
The dinner is being prepared by us