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CaseSingularPlural
Nominativeименительный · кто? что?диплом дипломы the subject: who or what acts
Accusativeвинительный · кого? что?диплом дипломы the direct object of the verb
Genitiveродительный · кого? чего?диплома дипломов possession, absence, "of"-phrases
Dativeдательный · кому? чему?диплому дипломам the receiver: to or for someone
Instrumentalтворительный · кем? чем?дипломом дипломами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?дипломе дипломах location and topics: in, at, about

Диплом 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 диплом 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.

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Slova drills диплом and every word like it with typed case endings, checked letter by letter.

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