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CaseSingularPlural
Nominativeименительный · кто? что?рыба рыбы the subject: who or what acts
Accusativeвинительный · кого? что?рыбу рыб the direct object of the verb
Genitiveродительный · кого? чего?рыбы рыб possession, absence, "of"-phrases
Dativeдательный · кому? чему?рыбе рыбам the receiver: to or for someone
Instrumentalтворительный · кем? чем?рыбой рыбами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?рыбе рыбах location and topics: in, at, about

Рыба 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 рыба 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 рыба and every word like it with typed case endings, checked letter by letter.

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