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CaseSingularPlural
Nominativeименительный · кто? что?зелёный зелёные the subject: who or what acts
Accusativeвинительный · кого? что?зелёный (inanimate) / зелёного (animate) зелёные (inanimate) / зелёных (animate) the direct object of the verb
Genitiveродительный · кого? чего?зелёного зелёных possession, absence, "of"-phrases
Dativeдательный · кому? чему?зелёному зелёным the receiver: to or for someone
Instrumentalтворительный · кем? чем?зелёным зелёными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?зелёном зелёных location and topics: in, at, about

Зелёный is an adjective: it copies the gender, number, and case of its noun. The table shows masculine and plural; feminine and neuter follow the same stem with their own endings.

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

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