1. Somebody built this castle in the 16th century.
This castle was built by somebody in the 16th century.
2. They will not finish this work tomorrow.
This work will not be finished tomorrow.
3. The teacher has checked our tests.
Our tests have been checked by the teacher.
4. We make the compressors for those machines here.
The compressors for those machines are made here.
5. He has not fixed the date for the next appointment
The date for the next appointment has not been fixed by him.
