Put the sentences into passive voice. Do not mention the agent unless it seems necessary.
1. The milkman brings the milk to my door but the postman leaves the letters in the hall.
2. In future, perhaps, they won't even bring letters to the houses and we shall have to collect them from the post office.
3. People steal things from supermarket every day; someone stole twenty bottles of whisky from this one week.
4. Normally men sweep this street every day, but nobody swept it last week.
5. The postman clears this box three times a day .He last cleared it at 2.30.
6. Someone turned on a light in the hall and opened the door.
7. Women clean this office in the evening after the staff has left; they clean the upstairs offices between seven and eight in the morning.
8. We never saw him in the dining- room. A maid took all his meals up to him.
9. Someone left this purse in the classroom yesterday; the cleaner found it.
10. We build well over 1000 new houses a year. Last year, we build 1500.
11. We serve hot meals till 10.30, and guests can order coffer and sandwiches up to 11.30.