The first one. He is a friend of Jane.
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Anonymous And what about ' He is a Jane's friend ' ?No.
AnonymousHe is a Jane's friendNo. You can never have a, an, or the together with a possessive like Jane's, Mr. Smith's, or even my or his.
Why do we say "friend of mine" and "friend of hers", but not "friend of Jane's"?
I came to this page, because I am writing a story, and found myself writing exactly that: "friend of Jane's" which didn't look grammatical, so I changed it to "friend of Jane", then it didn't sound right.
If you are trying to sound like a native English speaker you have a problem, because, it is incorrect, but that's what you will hear native English speakers say "I am a friend of Jane's