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CaseSingularPlural
Nominativeименительный · кто? что?ученик ученики the subject: who or what acts
Accusativeвинительный · кого? что?ученика учеников the direct object of the verb
Genitiveродительный · кого? чего?ученика учеников possession, absence, "of"-phrases
Dativeдательный · кому? чему?ученику ученикам the receiver: to or for someone
Instrumentalтворительный · кем? чем?учеником учениками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?ученике учениках location and topics: in, at, about

Ученик is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

Look up any other word in the Russian declension tool, see where ученик 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.

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