I received many books,many of them books,这个是独立主格 但为什么不需要在books前面加being啊

题目

I received many books,many of them books,这个是独立主格 但为什么不需要在books前面加being啊
有些非谓语动词为什么很多都不需要加being啊?好像 So many people absent from the meeting,the meeting had to be called off.为什么不需要在absent前面加being,

答案

明显的主表关系 则不需要加being
如So many people absent from the meeting这是形容词短语的独立主格结构 形容词与逻辑主语是明显的主表关系 加being属于多余