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CaseSingularPlural
Nominativeименительный · кто? что?чашка чашки the subject: who or what acts
Accusativeвинительный · кого? что?чашку чашки the direct object of the verb
Genitiveродительный · кого? чего?чашки чашек possession, absence, "of"-phrases
Dativeдательный · кому? чему?чашке чашкам the receiver: to or for someone
Instrumentalтворительный · кем? чем?чашкой чашками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?чашке чашках location and topics: in, at, about

Чашка 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 чашка 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 чашка and every word like it with typed case endings, checked letter by letter.

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