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CaseSingularPlural
Nominativeименительный · кто? что?дело дела the subject: who or what acts
Accusativeвинительный · кого? что?дело дела the direct object of the verb
Genitiveродительный · кого? чего?дела дел possession, absence, "of"-phrases
Dativeдательный · кому? чему?делу делам the receiver: to or for someone
Instrumentalтворительный · кем? чем?делом делами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?деле делах location and topics: in, at, about

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

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

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