"'She fell of she's chair' is grammatically incorrect because the possessive pronoun 'her' has been replaced with the nominative pronoun 'she'."
: "her book" would be a paradigm. Linguistically, a single word cannot be a paradigm.
paradigm: a set of linguistic items that form mutually exclusive choices in particular syntactic roles, such as with English determiners. We can say “a book” or “his book” but not “a his book"; (and no jokes about "a hymn book" !)
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