III. Change these sentences to the passive voice :
71. For centuries, poets, writers and musicians have mentioned ao dai in poems, novels and songs.
72. They are going to plant some flowers and plants in our school yard next week.
73. Students in secondary school shouldn’t drive motorbikes at school.
74. They had opened a new museum in this land before we came to live in Vietnam in 1999.
75. People said that Michael Jackson died of using too much cocaine.
76. Their boos made them work very hard until midnight.
77. This is the first time they have written to us about this.
78. How many lessons are you going to learn next month?
79. Someone had invented electric lights before I was born.
80. People know that Japan produces a wide range of cars.
III. Change these sentences to the passive voice :
71. For centuries, poets, writers and musicians have mentioned ao dai in poems, novels and songs.
For centuries, Ao dai has been mentioned in poems, novels and songs by poets, writers and musicians
72. They are going to plant some flowers and plants in our school yard next week.
Some flowers and plants are going to be planted in our school yard next week.
73. Students in secondary school shouldn’t drive motorbikes at school.
Motorbikes shouldn't be driven at school by students in secondary school
74. They had opened a new museum in this land before we came to live in Vietnam in 1999.
A new museum had been opened in this land before we were come to live in Vietnam in 1999.
76. Their BOOS made them work very hard until midnight.
They was made work very hard until midnight by their boss
77. This is the first time they have written to us about this.
This is the first time we have been written about this
78. How many lessons are you going to learn next month?
How many lessons are going to be learnt next month?
79. Someone had invented electric lights before I was born.
Electric lights had been invented before i was born
75. Michael Jackson was said to have died of using too much cocaine.