2.They told the new pupil where to sit.

=>The new pupil was told where to sit

3.I knew that they had told him of the meeting.

=>I knew that he had been told of the meeting by them

4.Nobody has ever treated me with such kindness.

=>I have never been treated with such kindness

Luckily for me, they didn't call my name.
=>Luckily for me,my name wasn't called
.After class,one of the students always erases the chalkboard.

=>Aftẻ class, the chalkboard is always erased by one of the students
 

You must clean the wall before you paint it.

-> The wall must be cleaned before you paint it.

 They told the new pupil where to sit.

-> The new pupil was told where to sit.

. I knew that they had told him of the meeting.

-> I knew that he had been told of the meeting.

 Nobody has ever treated me with such kindness.

-> I have never been treated with such kindness.