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CaseSingularPlural
Nominativeименительный · кто? что?гостиная гостиные the subject: who or what acts
Accusativeвинительный · кого? что?гостиную гостиные the direct object of the verb
Genitiveродительный · кого? чего?гостиной гостиных possession, absence, "of"-phrases
Dativeдательный · кому? чему?гостиной гостиным the receiver: to or for someone
Instrumentalтворительный · кем? чем?гостиной гостиными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?гостиной гостиных location and topics: in, at, about

Гостиная 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 гостиная 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 гостиная and every word like it with typed case endings, checked letter by letter.

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