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CaseSingularPlural
Nominativeименительный · кто? что?арбуз арбузы the subject: who or what acts
Accusativeвинительный · кого? что?арбуз арбузы the direct object of the verb
Genitiveродительный · кого? чего?арбуза арбузов possession, absence, "of"-phrases
Dativeдательный · кому? чему?арбузу арбузам the receiver: to or for someone
Instrumentalтворительный · кем? чем?арбузом арбузами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?арбузе арбузах location and topics: in, at, about

Арбуз 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 арбуз 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 арбуз and every word like it with typed case endings, checked letter by letter.

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