请帮忙分析一下这个句子的结构：They begin to think about what use could be made of such materials?
问题描述：
请帮忙分析一下这个句子的结构：They begin to think about what use could be made of such materials?
答
They | begin to think about | what use |（that） could be
(主语） （谓语） （宾语） （宾语补足语）
made of such materials?
意思是：他们 开始思考 这种材料可以被用来干什么.