Chuyển các câu với động từ chỉ nhận thức sau sang câu bị động

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.