It is so expersive a camera that he can't afford it.

问题描述:

It is so expersive a camera that he can't afford it.
It is —— —— expersive camera that he can't afford it.

It is (such)(an) expersive camera that he can't afford it.
so+ 形容词+a/an+名词=such+ a/an+ 形容词+名词