句子：They would try to decide what intelligencein humans is really for, not merely how much of it there is.
请老师帮忙剖析下is后面的句式成分，谢谢！
They would try todecide what intelligence in humans is really for, not merely how muchof it there is.
decide 后面接了两个宾语从句，由两个间接疑问句充当，见黑体部分。
第一个宾语从句是主系表结构：intelligence in humans 主语，is 系动词，for what 是表语，what 是介宾。for what = why 或 for what = for what purpose，表示“缘由或作用与功效”。
第二个宾语从句是there be 结构：it 指代 intelligence，how much of it 是主语，there is 在宾语从句中语序不变。
