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

⇒She has been heard to sing this song several times by me.

65. People saw him steal your car.

⇒He was seen to steal your car.

66. The teacher is watching the work.

⇒They are being watched to work by the teacher.

67. He won’t let you do that silly thing again.

⇒You won't be let to do that silly thing again

68. People don’t make the children work hard.

⇒The children aren't made to work hard.

69. They made him work all day.

⇒He was made to work all day.

70. The detective saw the woman putting the jewelry in her bag.

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

71. The terrorists made the hostages lie down.

⇒The hostages were made to lie down by the errorists.

72. Police advise drivers to use an alternative route.

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

73. She helps me to do all these difficult exercises.

⇒I am helped to do all these difficult exercises by her.