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CaseSingularPlural
Nominativeименительный · кто? что?кость кости the subject: who or what acts
Accusativeвинительный · кого? что?кость кости the direct object of the verb
Genitiveродительный · кого? чего?кости костей possession, absence, "of"-phrases
Dativeдательный · кому? чему?кости костям the receiver: to or for someone
Instrumentalтворительный · кем? чем?костью костями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?кости костях location and topics: in, at, about

Кость 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 кость 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 кость and every word like it with typed case endings, checked letter by letter.

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