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CaseSingularPlural
Nominativeименительный · кто? что?дверь двери the subject: who or what acts
Accusativeвинительный · кого? что?дверь двери the direct object of the verb
Genitiveродительный · кого? чего?двери дверей possession, absence, "of"-phrases
Dativeдательный · кому? чему?двери дверям the receiver: to or for someone
Instrumentalтворительный · кем? чем?дверью дверями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?двери дверях location and topics: in, at, about

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

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

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