Question

our classes were being taken by very efficient and sincere teachers in active voice

Answer 1

Very efficient and sincere teachers were taking our classes. (Active Voice)

Hope it helps :)

Answer 2

HEY FRIEND,
HERE IS THE ANSWER

Passive voice---our classes were being taken by very efficient and sincere teachers.

Active Voice --- Very efficient and sincere teachers were taking our classes.

MARK IT AS BRAINLIEST.
THANK YOU