what people are worried about is whether we will build a better future?分析句子结构

题目

what people are worried about is whether we will build a better future?分析句子结构
主语从句为什么要加what呢,没有也说得通啊

答案

what people are worried about is whether we will build a better future?这是一个主系表句型.what people are worried about 是主从作主语, what作介词about的宾语, 没有what就讲不通了,"人们担心"什么呢? 因此必...