Question

it was thought desirable to introduce a prayer(change the voice)​

Answer 1

The given passive voice sentence can be changed into active voice sentence as shown and explained below:

The principal thought it desirable to introduce a prayer.

Explanation

This is a subject implied case. A subject implied sentence in active-passive voice is a sentence that is passive but the subject is missing. While converting it into active we have to provide the subject from our side. This sentence is already passive. So we will provide the subject ‘The principal’ from our side.

Passive: was thought

Active: S+V2+by+O

Answer 2

Answer:

it was thought desirable to introduce a prayer ( change the voice)