Oh,there is a picture of mine on the wall.的mine为什么不是my快

Oh,there is a picture of mine on the wall.的mine为什么不是my快
Oh,there is a picture of mine on the wall.的mine为什么不是my
快

Oh,there is a picture of mine on the wall.的mine为什么不是my快
mine是名词性物主代词,my是形容词性物主代词,介词后面必须用名词性物主代词,所以是of mine
也可以说成my picture 与 a picture of mine 意思是一样的.

mine = my picture, a picture of 后面加名词或者名词性物主代词， 而my是物主代词，不具有名词性

名词性物主代词