Question

Change into passive voice why did your brother write such a letter

Answer 1

In a sentence with an active voice, the subject performs the action which is denoted by the verb. In other words, the subject is the doer of the verb's action. Whereas in a passive voice, the subject is not active but by the verb is acted upon.

Therefore, the above sentence in passive voice would be written as:

Why was such a letter written by your brother?

Answer 2

Answer:

Why was such a letter written by your brother?