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CaseSingularPlural
Nominativeименительный · кто? что?отпуск отпуска the subject: who or what acts
Accusativeвинительный · кого? что?отпуск отпуска the direct object of the verb
Genitiveродительный · кого? чего?отпуска отпусков possession, absence, "of"-phrases
Dativeдательный · кому? чему?отпуску отпускам the receiver: to or for someone
Instrumentalтворительный · кем? чем?отпуском отпусками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?отпуске отпусках location and topics: in, at, about

Отпуск is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where отпуск 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 отпуск and every word like it with typed case endings, checked letter by letter.

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