把下面的英语句子改写成被动语态！求指教～谢谢

Question

1.A generator can change the mechanical energy into electrical energy.
2.A car accident happened on thehighway this morning.People took away the wounded to hospital immediately,and the govement sent policeman there to cope with the event.
3.Forests of pine and fir cover two thirds of this area.
如果可以的话教一教方法！谢谢！

Answer 1

The mechanical energy  can  be changed  into electrical energy by  a generator.


A car accident happened on thehighway this morning.the wounded was taken away  to hospital by people  immediately,and the govement sent policeman there to cope with the event.

Ttwo thirds of this area are covered by forests of pine and fir .

方法，宾语变主语，谓语变成be +　被动语态　

Answer 2

  the mechanical energy can be changed into electrical energy by a generator.

2.A car accident happened on thehighway this morning. the wounded were  taken away  to hospital immediately,and  policemen were  sent  there to cope with the event.
3. two thirds of this area is  covered with forests of pine and fir.

Answer 3

the m can change into e by gen