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CaseSingularPlural
Nominativeименительный · кто? что?девушка девушки the subject: who or what acts
Accusativeвинительный · кого? что?девушку девушек the direct object of the verb
Genitiveродительный · кого? чего?девушки девушек possession, absence, "of"-phrases
Dativeдательный · кому? чему?девушке девушкам the receiver: to or for someone
Instrumentalтворительный · кем? чем?девушкой девушками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?девушке девушках location and topics: in, at, about

Девушка 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 девушка 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 девушка and every word like it with typed case endings, checked letter by letter.

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