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CaseSingularPlural
Nominativeименительный · кто? что?олень олени the subject: who or what acts
Accusativeвинительный · кого? что?оленя оленей the direct object of the verb
Genitiveродительный · кого? чего?оленя оленей possession, absence, "of"-phrases
Dativeдательный · кому? чему?оленю оленям the receiver: to or for someone
Instrumentalтворительный · кем? чем?оленем оленями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?олене оленях location and topics: in, at, about

Олень 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 олень 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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