Answer:
The mobile set was given to her by the boy.
Step-by-step explanation:
(this is just copied from grammarly but it's actually quite helpful--)
While tense is all about time references, voice describes whether the grammatical subject of a clause performs or receives the action of the verb.
Here’s the formula for the active voice:
[subject]+[verb (performed by the subject)]+[optional object]
Chester kicked the ball.
In a passive voice construction, the grammatical subject of the clause receives the action of the verb. So the ball from the above sentence, which is receiving the action, becomes the subject. The formula:
[subject]+[some form of the verb to be]+[past participle of a transitive verb]+[optional prepositional phrase]
The ball was kicked by Chester.