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CaseSingularPlural
Nominativeименительный · кто? что?мальчик мальчики the subject: who or what acts
Accusativeвинительный · кого? что?мальчика мальчиков the direct object of the verb
Genitiveродительный · кого? чего?мальчика мальчиков possession, absence, "of"-phrases
Dativeдательный · кому? чему?мальчику мальчикам the receiver: to or for someone
Instrumentalтворительный · кем? чем?мальчиком мальчиками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?мальчике мальчиках location and topics: in, at, about

Мальчик 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 мальчик 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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