1 We planted many trees in the school garden

=> Many trees were planted in the school garden.

2 Some one has taken my book away

=> my book has been taken away.

3 He didn’t help me with my homework

=> I wasn't helped with my homework.

4 We have learnt English for three years

=> English has been learnt for three years.

5 my farther often reads books before bed time

=> Books are often read by my father before bedtime.

6 LAN bought some comic books for her brother

=> some comic books were bought for her brother by Lan.

7 My sister received a letter yesterday

=> A letter was received yesterday.

8 she can solve the problem in just two minutes

=> the problem can be solved in just 2 minutes.

9 Now a days people use electricity for lighting

=> Electricity was used for lightning nowadays.

-1) Many trees were planted in the school -2) My book has been taken away -3) l weren’t helped with my homework -4) English has been learnt for three years -5)books often are read by my father before bed time -6) some comic books were bought for her brother by Lan -7) a letter was received by my sister yesterday -8) The problem can be solved in just two minutes