1. . I have heard her sing this song several times

-> She has been heard to sing this song several times.

2). People saw his steal your car

-> He was seen to steal your car.

3). The teacher is watching the work

-> The work is being watched by the teacher.

4). He won't let you do that silly thing again

-> You won't be let to do that silly thing again.

5). People don't make the children work hard

-> They children aren't made to work hard.

6). They made him work all day

-> He was made to work all day.

7). The detective saw the woman putting the jewelry in her bag

-> The woman was seen putting the jewelry in her bag by the detective.

8). The terrorists made the hostages lie down

-> The hostages were made to lie down by the terrorists.

9). Police advise drivers to use an alternative route

-> Drivers are advised to use an alternative route by the police.

10). She helps me to do all these difficult exercises

-> I am helped to do all these difficult exercises.