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CaseSingularPlural
Nominativeименительный · кто? что?район районы the subject: who or what acts
Accusativeвинительный · кого? что?район районы the direct object of the verb
Genitiveродительный · кого? чего?района районов possession, absence, "of"-phrases
Dativeдательный · кому? чему?району районам the receiver: to or for someone
Instrumentalтворительный · кем? чем?районом районами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?районе районах location and topics: in, at, about

Район is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where район ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills район and every word like it with typed case endings, checked letter by letter.

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