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CaseSingularPlural
Nominativeименительный · кто? что?чай чаи the subject: who or what acts
Accusativeвинительный · кого? что?чай чаи the direct object of the verb
Genitiveродительный · кого? чего?чая чаёв possession, absence, "of"-phrases
Dativeдательный · кому? чему?чаю чаям the receiver: to or for someone
Instrumentalтворительный · кем? чем?чаем чаями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?чае чаях location and topics: in, at, about

Чай 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 чай 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 чай and every word like it with typed case endings, checked letter by letter.

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