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CaseSingularPlural
Nominativeименительный · кто? что?друг друзья the subject: who or what acts
Accusativeвинительный · кого? что?друга друзей the direct object of the verb
Genitiveродительный · кого? чего?друга друзей possession, absence, "of"-phrases
Dativeдательный · кому? чему?другу друзьям the receiver: to or for someone
Instrumentalтворительный · кем? чем?другом друзьями the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?друге друзьях location and topics: in, at, about

Друг 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 друг 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 друг and every word like it with typed case endings, checked letter by letter.

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