The passive voice for the sentence "The doctor had examined him" is "He had been examined by the doctor". This is formed by making the object of the active sentence ("him") the subject ("He"), adding the past perfect auxiliary verbs "had been," and then including the past participle of the main verb ("examined"). The original subject ("the doctor") is then added at the end after the preposition "by".
The doctor had examined him. (Passive Voice)
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