Last Wednesday they wrote a test.
A test was written by them last Wednesday.
The Jones built a new house 2 years ago.
A new house was built 2 years ago by Jones.
The students will watch this video in a day.
This video will be watched in a day by the students.
The teacher can give you the most difficult task.
The most difficult task can be given you by the teacher.
Children usually get books in the library.
Books in the library are usually gotten by children.