some books are to be tasted.

问题描述:

some books are to be tasted.
我知道这句话的意思是,有些书可以浅尝辄止.
想问的是,这是个什么语法,BE动词后边怎么跟to啊?

动词不定式作表语
又如
be to blame
应受谴责
The children were not to blame.
孩子们不应受到谴责.
The driver was not to blame for the traffic accident.
那次交通事故不应该责怪司机.
I am to blame.
是我不好.