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CaseSingularPlural
Nominativeименительный · кто? что?Япония Японии the subject: who or what acts
Accusativeвинительный · кого? что?Японию Японии the direct object of the verb
Genitiveродительный · кого? чего?Японии Японий possession, absence, "of"-phrases
Dativeдательный · кому? чему?Японии Япониям the receiver: to or for someone
Instrumentalтворительный · кем? чем?Японией Япониями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?Японии Япониях location and topics: in, at, about

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

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