定义
在复合句主句中名词性成分之后与该名词性成分并列，补充说明该名词性成分的有关情况的名词性从句，被称为同位语从句。例句
引导同位语从句的词语通常有连词that，whether，连接代词和连接副词等。由that引导 1.They were worried over the fact that you were sick.他们为你生病发愁。
2.The news that we are having a holiday tomorrow is not true.明天放假的消息不实。
由whether引导 1.We are not investigating the question whether he is trustworthy.我们不是在调查他是否可以信任的问题。
2.Answer my question whether you are coming.你回答我的问题：你来不来。
由连接代词引导 1.Have you any idea what time it starts?你知道什么时候开始吗?
2.From 1985-90 I was an instructor at the regional party headquarters.After that I went back to work in a factory.Then I had no idea what a casino was.从1985年到1990年我是地方党部的教员，随后我回到一家工厂工作，当时我不知道赌场是什么样的地方。
由连接副词引导 1.I have no idea when he will come back.我不知道他什么时候回来。
2.You have no idea how worried I was!你不知道我多着急！