the reason why...是定语从句还是同位语从句

the reason why……应该是定语从句从句吧，the reason that……应该有时是同位语从句吧？那如果tje reason why是定从，why是作原因状语吗？

reason可以后接that引导的同位语从句。例如：

The reason that he was alergic to alcohol couldn't convince the lawyer.

He was late again. The reason that there was heavy traffic didn't convince his teacher.

You failed in the exam. You can't deny the reason that you didn't study hard.

reason后的that从句如果是同位语从句,that为连词不作成分，也没有词义。逻辑上有The reason is/was that...这层关系。

网友可以据此判断that从句是否同位语从句。

曹荣禄 -

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刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编 1秒前

擅长：语法理论,语言学,文化背景

reason 后可以接 that 引导的定语从句，此时that 等于 why 之意，但不是同位语从句，因为它跟 reason 不存在同位关系。

以下表达都正确，都要了解并掌握：

Tell me the reason why you are late.

Tell me the reason that you are late.

Tell me the reason for which you are late.

Tell me the reson you are late.

以上4句意思相同。划线部分都是定语从句。

Tell me the reason (that) he gave you. （此句 that 作gave 的宾语。）