idea,fact,news,hope,belief,suggestion,proposal,word,thought,doubt,truth,possibility,promise,order等有一定内涵的名词｡而定语从句的先行词可以是名词､代词､主句的一部分或是整个主句｡如:The possibility that the majority of the labour force will work at home is often discussed.人们经常讨论大多数劳动力将会在家里工作的可能性｡(同位语从句) We are not looking into the question whether he is worth trusting. 我们正在调查的问题不是他是否值得信赖的问题｡(同位语从句)
