Question

Change the voice
which house did they paint

Answer 1

hey mate here's ur answer

Passive Voice : Which house was painted by them ?

Answer 2

Given sentence

Which house did they paint


To change the sentence to its passive form.

Given sentence is simple past Interrogative. While changing to passive,

» For interrogatives, did changes to was

» Object comes before the subject in passive voice.

» By is used before the doer of the action.

» Verb should always be in its 3rd form


Hence your answer is :-

Which house was painted by them?