My friend or mine friend. Which is correct?

here, we can either use my friend or a friend of mine. in this case, we can use my friend/friends for singular or plural verb, and 'a friend of mine' is used to only singular verb and single frnd. eg: a friend of mine presented me a gift. and my frnd/ frnds presented me a gift.

Mine friend' is incorrect English. The correct answer would be - 'My friend'. 'Mine' shows possession. 'Mine' is used to refer to a thing or things belonging to or associated with the speaker. Whereas, 'My' means - belonging to or associated with the speaker.