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CaseSingularPlural
Nominativeименительный · кто? что?кассир кассиры the subject: who or what acts
Accusativeвинительный · кого? что?кассира кассиров the direct object of the verb
Genitiveродительный · кого? чего?кассира кассиров possession, absence, "of"-phrases
Dativeдательный · кому? чему?кассиру кассирам the receiver: to or for someone
Instrumentalтворительный · кем? чем?кассиром кассирами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?кассире кассирах location and topics: in, at, about

Кассир 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 кассир 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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