Subject

    Language And Communication

    Topic

    Voice

    We must have obeyed our teachers.

    ক)
    Our teachers might have obeyed.
    খ)
    Our teachers might have been obeyed.
    গ)
    Our teachers must have been obeyed.
    ঘ)
    Our teachers must have obeyed.

    Explanation

    If we have "Subject + Modal Auxiliary verb + have + third verb + object" then we change it to Passive subject + Modal Auxiliary verb + have been + third form + by + passive object. Modal Auxiliary verb are : can, could, shall, will, may, might, should, would, must, ought to etc.

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