Rewrite the given sentences in passive voice?

1)He often checks the battery in the car.
2)They planted twenty busher.
3)The man drives this car.
4)My parents bought me a mobile phone for my succeessful studyir

1) The battery in the car is often checked by him.
2) Twenty bushes were planted by them.
3) This car is driven by the man.
4) I was bought a mobile phone by my parents for my succeessful studies.