1. My brother told me a boring story.
I was told a boring story by my brother.
2. Keepers feed the elephants twice a day at the zoo.
The elephants are fed by keepers twice a day at the zoo.
3. No one has identified the man yet.
The man hasn't been identified yet.
4. Someone is servicing my car today (at the garage).
My car is being serviced by someone at the garage today
5. Someone stole my bicycle last week.
My bicycle was stolen by someone last week.
6. Someone cleans the windows of our flat once a month.
The windows of our flat are cleaned by someone once a month.
2.didn't they
3.doesn't he
4.can't she
5.mustn't she
6.haven't we
7.didn't he
8.did they
9.won't she
10.isn't he
11.aren't we
12.didn't he
13.weren't they
14.won't she
15.isn't he
16.isn't he
17.are there
18.doesn't she