1)The principal appointed Sara and me as prefects.
2)The police will arrest the gang of robbers soon.
3)We have to complete the work tonight.
4)The waiter handed the girls the bill.
5)Gary'd father gave him permissin to use the family car.
6)My aunt told me where she kept her money.
7)Mr.Lim had donated a lot of money to the fund.
8)The policemen fined Ah Sheng for speeding.
9)My neighbour watered my plants when I was away.
10)Siu Wen drove the car into the garage.
11)The boys took down the poster from the wall.
12)The maid served dinner late last night.
13)Lily's parents reminded her to bring her house keys.

1)The principal appointed Sara and me as prefects.
被动 Sara and I were appointed as prefects by the pricipal.

2)The police will arrest the gang of robbers soon.
被动 The gang of robbers will be arrested by the police soon.

3)We have to complete the work tonight.
被动 The work must be completed (by us)tonight.

4)The waiter handed the girls the bill.
被动 The girls were handed the bill from the waiter.

5)Gary's father gave him permission to use the family car.
Gary got the permission to use the family car from his father

6)My aunt told me where she kept her money.
被动 I was told by my aunt that where she kept her money.

7)Mr.Lim had donated a lot of money to the fund.
被动 A lot of money had been donated to the fund by Mr.Lim.

8)The policemen fined Ah Sheng for speeding.
被动 Ah Sheng was fined for speeding by the policemen.

9)My neighbour watered my plants when I was away.
被动 My plants were watered by my neighbor when I was away.

10)Siu Wen drove the car into the garage.
被动 The car was drove into the garage by Siu Wen.

11)The boys took down the poster from the wall.
被动 The poster was took down from the wall by the boys.

12)The maid served dinner late last night.
被动 Dinner was served late by the maid last night

13)Lily's parents reminded her to bring her house keys.
被动 Lily was reminded by her parents to bring her house key
s.

好像都是改被动句的意思