Mr. " is OK? No, sorry—I don't even know what it means.
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Mr. TomIs the use of "How must I know?" is OK?No, sorry—I don't even know what it means. Is it one of these?—
Mr. TomAm I to understand that although the structure "How must" does not work in "How must I know?", it is OK in "How must he feel?"It is the pronoun that validates the meaning.