Question

Keep the ball rolling.(change the voice)

Answer 1

let the balls keep rolling. hope it helps you

Answer 2

Active voice: Keep the ball rolling

Subject “ball” perform the verb (action) “rolling”.

Passive voice: The ball was kept rolling  

Here, the rolling action is given more stressed than the subject ball.  

Was kept  verb + auxiliary verb.

In active voice, the subject acts upon the verb.

In passive voice, the subject would be acted upon. When we are changing active to passive, the reversion process should be followed.