Question

change in passive voice He bought his son a book​

Answer 1

Explanation:

A book.is being brought by the son for him...

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Answer 2

His son was bought a book by him. -This is the answer.

About passive voice:

• The given sentence is in active voice. We have to change it into passive voice.
• When a sentence is changed into passive voice, the subject becomes passive/ inactive. So the subject 'he' becomes 'by him' and comes at last.
• The object and the action done take importance. Thus the sentence begins either with the direct object (a book) or indirect object (his son).
• The tense must be retained. The verb takes its past participle form.
• The 'be' verb will precede the past participle according to its tense.  So the verb 'bought' which is in simple past becomes 'was bought'.
• Therefore the answer is: His son was bought a book by him. (or) A book was bought for his son by him.