Question

let the work be done properly. change into passive voice​

Answer 1

Answer:

Let the work be done properly (passive voice)

=> Do the work properly. (active voice)

[If you meant to convert it into active voice then that's the answer. ]

Change to passive voice :-

Let the work be done properly.

Because its already in passive voice.

Answer 2

To active voice.

Do the work properly.

Hope it helps.