Question Detail
We must have obeyed our teachers.
- Our teachers might have obeyed.
- Our teachers might have been obeyed.
- Our teachers must have been obeyed.
- Our teachers must have obeyed.
Answer: Option C
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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