Change the following sentences into passive
1.He had done all his tasks before he left his office.
2.My parents will give me a bike on my birthday next week.
3.I shall not help the lazy boy.
4.They could make these things without your help.
5.Students should go over their lessons before class.
6. Mary is cutting the cake with a sharp knife.
7.Nobody has ever treated me with such kindness.
8.Someone will tell him that news.
9. A sudden increase in water pressure may break the dam.
10.John used to visit Mr Cole at weekends.
11. I made him do it.
12. She had him photocopy the documents.
13. I heard him giving orders.
14. Troops have surrounded the town.
15. My grandmother continues to tell many interesting fairy tales every evening.
16.I saw him enter the house
17. She advised us to keep the gate unlocked