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CaseSingularPlural
Nominativeименительный · кто? что?театр театры the subject: who or what acts
Accusativeвинительный · кого? что?театр театры the direct object of the verb
Genitiveродительный · кого? чего?театра театров possession, absence, "of"-phrases
Dativeдательный · кому? чему?театру театрам the receiver: to or for someone
Instrumentalтворительный · кем? чем?театром театрами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?театре театрах location and topics: in, at, about

Театр 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 театр 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 театр and every word like it with typed case endings, checked letter by letter.

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