請問一句英文中的介係詞”of”

Question

She has covered her bedroom walls with posters.The posters are of her idol:Tiger Woods.
請問為什麼第二句The posters are of her idol 要加of呢
可以分析一下文法嗎 謝謝

Answer 1

The original sentence is "The posters are the ones/posters of her idol: Tiger Woods.

Now, you understand?

Answer 2

of + 名詞=adj
eg:
of use有用的(useful)
of no use無用的(useless)
of no value 沒有價值的(valueless)

Answer 3

這邊的 of...是因為是當  的 ..他要表達她的偶像的海報..如果你用her idol's poster ..會便他偶像自己的海報但你用 poster of her idol ..就會變成偶像的海報 ( 海報上是 她的偶像Tiger Woods )