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CaseSingularPlural
Nominativeименительный · кто? что?комната комнаты the subject: who or what acts
Accusativeвинительный · кого? что?комнату комнаты the direct object of the verb
Genitiveродительный · кого? чего?комнаты комнат possession, absence, "of"-phrases
Dativeдательный · кому? чему?комнате комнатам the receiver: to or for someone
Instrumentalтворительный · кем? чем?комнатой комнатами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?комнате комнатах location and topics: in, at, about

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

Look up any other word in the Russian declension tool, see where комната 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 комната and every word like it with typed case endings, checked letter by letter.

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