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CaseSingularPlural
Nominativeименительный · кто? что?озеро озёра the subject: who or what acts
Accusativeвинительный · кого? что?озеро озёра the direct object of the verb
Genitiveродительный · кого? чего?озера озёр possession, absence, "of"-phrases
Dativeдательный · кому? чему?озеру озёрам the receiver: to or for someone
Instrumentalтворительный · кем? чем?озером озёрами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?озере озёрах location and topics: in, at, about

Озеро is a neuter noun; the ending pattern above repeats across most neuter nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where озеро 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 озеро and every word like it with typed case endings, checked letter by letter.

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