Plural, The words

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Why is it "sky" in singular and "heaven" in plural? What is this "esa" that is added? There is an answer

Why is it sky in singular and heaven in plural? What is this esa that is added? There is an answer - My, Russian language, The words, Old Russian language, Linguistics, Plural, Suffix

Old Russian language Linguistics Plural Russian language The words Suffix

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