当名词后面所接的从句表示与名词同位并为名词的实际内容时，这个从句就是同位语从句。如：
The news that China has joined the WTO excite us all. 中国加入了世界贸易组织这一消息使我们大家兴奋不已。
He told us the truth that he fell down from his bike this afternoon. 他告诉了我们他从单车上摔下来这一真相。
同位语中应注意：
1. 高中所学能带同位语从句的名词不多，常见的有：answer, belief, conclusion, decision, discovery, doubt, explanation, fact, hope, idea, information, knowledge, law, message, news, opinion, order, possibility, problem, promise, proof, proposal, question, report, risk, rumor, story, suggestion, truth, theory, thought, wish, word等。如：
He sent us a message that he won’t come next week. 他送信来告诉我们说，下周他不来了。
There is no doubt that he is fit for this job. 毫无疑问，它适合这一工作。
