May I come in sir is incorrect. Write it as May I come in, sir? There is no passive form.
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May I come in sir is incorrect. Write it as May I come in, sir? There is no passive form.
Anonymous May I come in, sir?
Bear in mind that sentences with only transitive verbs (those which receive object) can become passive. In other words, there always must be an object in the active form to become the subject in the passive form.
'come' in your sentence is intransitive, thus impossible for the sentence to become passive.