An opinion is what someone believes is true but has not been proved 分析句子结构

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Anopinioniswhatsomeonebelievesistruebuthasnotbeenproved分析句子结构Anopinioniswhatsomeonebelievesistruebut

An opinion is what someone believes is true but has not been proved 分析句子结构
An opinion is what someone believes is true but has not been proved 分析句子结构

An opinion is what someone believes is true but has not been proved 分析句子结构
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.
如果将WHAT放回从句中,从句正常的语序是:someone believes/ "what" is true but has not been proved.从句谓语是believes,后面是一个宾语从句,含有两个并列句,但主语都是what,因此but后面省略了主语.(what)has not been proved是一个被动句.
不知我解释的明白否?