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CaseSingularPlural
Nominativeименительный · кто? что?лев львы the subject: who or what acts
Accusativeвинительный · кого? что?льва львов the direct object of the verb
Genitiveродительный · кого? чего?льва львов possession, absence, "of"-phrases
Dativeдательный · кому? чему?льву львам the receiver: to or for someone
Instrumentalтворительный · кем? чем?львом львами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?льве львах location and topics: in, at, about

Лев is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

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

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