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CaseSingularPlural
Nominativeименительный · кто? что?календарь календари the subject: who or what acts
Accusativeвинительный · кого? что?календарь календари the direct object of the verb
Genitiveродительный · кого? чего?календаря календарей possession, absence, "of"-phrases
Dativeдательный · кому? чему?календарю календарям the receiver: to or for someone
Instrumentalтворительный · кем? чем?календарём календарями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?календаре календарях location and topics: in, at, about

Календарь 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 календарь 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 календарь and every word like it with typed case endings, checked letter by letter.

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