Question

they were painting the door.
change in passive voice

Answer 1

$\huge \boxed {\texttt {\fcolorbox {red} {aqua} {SOLUTION}}}$
$<b ><i >$
=> ✨The door was being painted by them. ✨

$<marquee >HOPE IT HELPS! </marquee >$

Answer 2

The door was being painted by them.