This book divides vocabulary into a large number of different topics,probably far too many for a notebook.
这里逗号后的probably far too many for a notebook是什么语法,什么成分,是定语从句修饰整个句子吗?如果是限制性定语从句,为什么会有逗号:如果是非限制性,那它的引导词+be为什么可以省略。还是这是一个插入语?状语?
This book divides vocabulary into a large number of different topics, probably far too many for a notebook.
逗号后的probably far too many for a notebook 可以看作是非限制性定语,由非限制性定语从句省略而来。原句相当于:
This book divides vocabulary into a large number of different topics, which are probably far too many for a notebook.