Which is the correct passive form of: We must write to him

The correct passive form of "We must write to him" is "He must be written to." Here's why:

    
• Passive Voice: In passive constructions, the focus shifts from the doer of the action (in this case, "we") to the recipient of the action (here, "he").
    
• Structure: The structure for passive voice is typically: Subject + form of "to be" + past participle + (optional agent). In this case, "must be" is the correct form of "to be," and "written" is the past participle of "write."
    
• Meaning: The sentence "He must be written to" indicates that it is necessary for someone (implied "us") to write to "him," emphasizing the action directed towards "him."

In contrast, the other options either do not correctly use passive voice, change the meaning, or introduce incorrect elements. Therefore, the answer is correct and clearly follows the rules for forming a passive voice sentence.

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