An opinion is what someone believes is true but has not been proved 分析句子结构
问题描述：
An opinion is what someone believes is true but has not been proved 分析句子结构
答
整个句子为主、系、表结构：An opinion /is /what someone believes is true but has not been proved.这个句子比较复杂的是表语,是一个表语从句（也属于名词性从句）.因为从句的宾语语中缺少成分而是用"what"引导....