I don't believe the news that you have told me.定语从句 I don't believe the news that you have passed the exam.同位语从句 定语从句中的that 在定语从句中要充当成分,要么是主语,要么是宾语或者是表语；that 在定语从句中充当宾语时可以省略 同位语从句中that 不充当成分,不能省略. 同位语从句还可以把前面的名词抹去不看,句子依然不缺成分,依然完整,而定语从句不能把前面的名词抹去不看,抹去后就缺成分了.
