1) computers are used by students at their lessons.
2) the rules of the game were explained by teather to the students.
3) a special dinner is cooced by Ann on the 21st of May.
4) a nice picnic was arraned by they last month.
5) these funny pictures were drawn by little boy.
1.(Who?)The people went home after they (What did you do?) had finished their work.
2. (Who?) The young man (What did you do?) has decided to buy the new vase after the old one had fallen down and broken to pieces.
3. The lecture has begun (what time did you do?)by the time I entered the room.