之前也有類似的疑問， 跟母語人士討論時有google到一篇別人的回文，覺得蠻實用的， 跟熟悉程度有關，參考看看 Group A: familiar The (b) version sounds not quite right (or "unusual"): 1a. He's a friend of Jack's 1b. He's a friend of Jack 2a. He's a teacher of Jack's 2b. He's a teacher of Jack Group B: quite familiar Both versions sound normal; the focus in each is slightly different: 3a. He's a friend of my sister's 3b. He's a friend of my sister 4a. He's a friend of Mr Whiteside's 4b. He's a friend of Mr Whiteside Group C: more remote The (a) version sounds "chummy", perhaps oddly so: 5a. He's a pupil of Francis Bacon's 5b. He's a pupil of Francis Bacon 6a. He's a friend of the Pope's 6b. He's a friend of the Pope Group D: very remote The (a) version begins to sound inappropriate: 7a. He's a grandson of Queen Victoria's 7b. He's a grandson of Queen Victoria Thus the movement on the scale is from a preference for the a) forms towards a preference for the b) forms. There is also another group, which does not relate to "familiarity": Group E: ecliptic Another meaning takes precedence; thus here in b) the meaning "someone who stu died Kant" eclipses the meaning "one of Kant's students": 8a. He was a student of Kant's 8b. He was a student of Kant --

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