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CaseSingularPlural
Nominativeименительный · кто? что?диета диеты the subject: who or what acts
Accusativeвинительный · кого? что?диету диеты the direct object of the verb
Genitiveродительный · кого? чего?диеты диет possession, absence, "of"-phrases
Dativeдательный · кому? чему?диете диетам the receiver: to or for someone
Instrumentalтворительный · кем? чем?диетой диетами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?диете диетах location and topics: in, at, about

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

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