"On nie jest moim przyjacielem, on jest moim znajomym."
Translation:He is not my friend, he is my acquaintance.
January 28, 2016
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This is a "X jest Y" type of sentence where the subject complement Y must take the instrumental case.
Possessive pronouns take the same case as the noun they refer to, so since przyjaciel and znajomy take the instrumental case, so should mój.