I’ve been friends with the Murkets for twenty years.

This is a sentence from Longman Dictionary.

How can we explain this? I thought when the pronoun was "I" we must say a friend not friends. I understand the meaning, but what about structure?

I think there should be subject and complement agreement. Sorry I cannot say what I mean in a better way! I hope you understand what I mean.

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    "I am a friend of Stephen" = "I am friends with Stephen" = "Stephen and I are friends" = Stephen is my friend" = "I am Stephen's friend". Isn't English wonderful :) – Mari-Lou A Feb 16 '18 at 23:25