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