Question

change the voice :the headmaster gave them books as prizes​

Answer 1

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They were given books as prizes by the Headmaster.

Answer 2

The voice of the given sentence can be changed as shown and explained below:

They were given books as prizes by the headmaster.

Explanation

The verb in the sentence was Simple Past in the active form (gave). When we convert the active voice of Simple Past into passive voice, we use passive form equivalent to the active form. The active form in Simple past is 'V2' or Simple Past form of the verb. The object is made the subject and vice versa; 'by' is added. The passive form in Simple Past is was/were +V3.