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CaseSingularPlural
Nominativeименительный · кто? что?знакомый знакомые the subject: who or what acts
Accusativeвинительный · кого? что?знакомого знакомых the direct object of the verb
Genitiveродительный · кого? чего?знакомого знакомых possession, absence, "of"-phrases
Dativeдательный · кому? чему?знакомому знакомым the receiver: to or for someone
Instrumentalтворительный · кем? чем?знакомым знакомыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?знакомом знакомых location and topics: in, at, about

Знакомый 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 знакомый 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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