She's a friend of my sister's (or sister)? What is right?
Sarah: What's this photo?
Connor: It's from our New Year's Eve party.
S: You look as though you're having a great time. Who's the girl at the front, the one in the shiny, grey dress?
C: She's a friend of my sister's.
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Hi Egor!
She's a friend of my sister's---is correct.
2017年3月30日
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No idea why Nate was down voted, but saying "friend of my sister" is exactly the same as "friend of my sister's". Granted, my former example is more common these days, but "friend of my sister's" is still correct. (Nate, I'm with you on this~)