the reason that the reason why 的区别 the reason that he was late was unknown 对么 求通俗易懂的解释

Question

the reason that the reason why 的区别 the reason that he was late was unknown 对么 求通俗易懂的解释

Answer 1

首先,the reason that he was late was unknown 是错的,改正后应该是：The reason WHY he was late is unknown.=== The reason FOR WHICH(由于这个原因) he was late is unknown.
1 the reason why
把 Tell me the reason.和You were late for that reason合并起来,你就得到了the reason for,
----------- Tell me the reason WHY (==FOR WHICH) you were late.
翻译：告诉我他为什么不来/ 他不来的理由.
2 the reason that / which
把Tell me the reason.和He has given the reason for not coming合并起来,你就得到了一个定语从句；
------------- Tell me the reason THAT / WHICH (==THE REASON做GIVEN的宾语) he has given for not coming.
翻译：告诉我他所提出的不来的理由.