Question

they have bought a new car ( voice change)​

Answer 1

A new car have been bought by them

Answer 2

Answer:

A new car has been bought by them.

Explanation:

For voice change, interchange the subjects' positions ( 'them' and 'car') followed by change of tense.

Here, 'has/have+ past form of verb' is present perfect.

In the passive voice, it will change to present perfect continuous- 'has/have + been + past form of verb'.

[ The present form of 'brought' is 'bring.' ]