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CaseSingularPlural
Nominativeименительный · кто? что?гриб грибы the subject: who or what acts
Accusativeвинительный · кого? что?гриб грибы the direct object of the verb
Genitiveродительный · кого? чего?гриба грибов possession, absence, "of"-phrases
Dativeдательный · кому? чему?грибу грибам the receiver: to or for someone
Instrumentalтворительный · кем? чем?грибом грибами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?грибе грибах location and topics: in, at, about

Грибы 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 грибы 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 грибы and every word like it with typed case endings, checked letter by letter.

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