11.1 Pronouns in Greek for the most part work much as they do in English: they replace nouns. Since Greek nouns are distinguished by gender, number, and case, it is logical that the pronouns that replace them inflect to represent these same qualities. You have already seen this basic mechanism in practice: the definite article is the same gender, number, and case as the noun that it modifies.
11.2 Most pronoun endings closely resemble the definite article. Let us review forms of the definite article (S 332, G 61):
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