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.