沒有很固定的介詞 要依情況而定
例：
We shifted the bookcase around.
我們搬動檾了書架的位置。
We can set the bookcase in.
我們把這個書櫥放進去。
The room held two glass-fronted bookcase.
房間裏有兩個玻璃書櫥。
May I have one of these bookcase?
這些書櫥我買壹個可以嗎？
Put the books back into the bookcase.
把書放回書架上去。
A bookcase screens off part of the room.
有個書櫃把房間隔開了壹部分。
He built in a bookcase between the windows.
他在窗與窗之間加設了書櫥。
Shall we put the bookcase against the wall?
我們是要把書櫃靠著墻嗎？
bookshelf 不僅指書架 還有書架型的東西都用bookshelf
例：
Can you stand the bookshelf up?
妳能把這個書架豎立起來嗎？
he said running to the bookshelf.
他壹邊說壹邊跑向書架。
The bookshelf is fastened to the wall.
書架被固定在墻上。
Please help me to shift the bookshelf about.
請幫助我把書架掉個向。
He carefully arranged all his books on the bookshelf.
他仔細地把書擺在書架上。
I am neaten the books on the low bookshelf.
我正在整理矮書架上的書。
I tried to bring some order to the bookshelf.
我設法把書架整得有條理些。
She began neatening the books in the low bookshelf.
她開始整理放在矮書架上的書。
My dictionary has disappeared from my bookshelf where I put it.
我的字典是我放在書架上的，現在不見了。
妳那個應該是用in one's bookcase
on the bookshelf