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CaseSingularPlural
Nominativeименительный · кто? что?праздник праздники the subject: who or what acts
Accusativeвинительный · кого? что?праздник праздники the direct object of the verb
Genitiveродительный · кого? чего?праздника праздников possession, absence, "of"-phrases
Dativeдательный · кому? чему?празднику праздникам the receiver: to or for someone
Instrumentalтворительный · кем? чем?праздником праздниками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?празднике праздниках location and topics: in, at, about

Праздник 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 праздник 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 праздник and every word like it with typed case endings, checked letter by letter.

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