Anonymous why he is not used instead of him 'But' is a preposition; 'him' is the object of the preposition. From the Am Heritage Dictionary: Traditional grammarians have worried over what form the pronoun ought to take when but is used to indicate an exception in sentences such as No one but I (or No one but me) has read it. Some have argued that but is a conjunction in these sentences and therefore should be followed by the nominative form I.
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Anonymouswhy he is not used instead of him'But' is a preposition; 'him' is the object of the preposition. From the Am Heritage Dictionary: