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CaseSingularPlural
Nominativeименительный · кто? что?вторник вторники the subject: who or what acts
Accusativeвинительный · кого? что?вторник вторники the direct object of the verb
Genitiveродительный · кого? чего?вторника вторников possession, absence, "of"-phrases
Dativeдательный · кому? чему?вторнику вторникам the receiver: to or for someone
Instrumentalтворительный · кем? чем?вторником вторниками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?вторнике вторниках location and topics: in, at, about

Вторник 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 вторник 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 вторник and every word like it with typed case endings, checked letter by letter.

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