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CaseSingularPlural
Nominativeименительный · кто? что?мнение мнения the subject: who or what acts
Accusativeвинительный · кого? что?мнение мнения the direct object of the verb
Genitiveродительный · кого? чего?мнения мнений possession, absence, "of"-phrases
Dativeдательный · кому? чему?мнению мнениям the receiver: to or for someone
Instrumentalтворительный · кем? чем?мнением мнениями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?мнении мнениях location and topics: in, at, about

Мнение 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 мнение 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 мнение and every word like it with typed case endings, checked letter by letter.

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