谈一下经验,愿有助!
同位语从句名词都很特殊,如condition,report,phenomenon等
且that/whether等引导的同位语整句是解释名词的,是不缺少成分的,这是辨别的关键
例：The condition that we face now.是定语从句,定语从句中we face 本身不构成整句,要依靠先行词condition.
The condition that our sky is becoming darker is very serious.
这是同位语从句, that our sky is becoming darker ,that后明显是一个不缺成分的整句.
清楚一些了么?