reason同位语从句和定语从句

reason后的同位语从句只能由that引导，而定语从句可以由that、which、why等引导。

从句由that引导时，that在同位语从句中不作成分，从句本身结构即是完整的；而that在定语从句中作名词性成分如主语、宾语、表语。

The reason (that) he told us was not true.

他告诉我们的理由不是真的

I don't know the reason why she hates me.

我不知道她为什么恨我

Give me a reason which could satisfy my curiosity.

给我个理由来满足我的好奇心吧