reason后接定从与同位语的的问题

你好陈老师，在百度文库看到你的《先行词为reason-定语从句精品讲课》的PPT，对文中的几个句子还是不太了解，向你求教一下。

1）the reason that后接具体缘由：

The reason that he was ill yesterday is such a bad excuse.这个句子可以理解为同位语从句吗？

2) The reason why his mother was late with dinner is that there were so many dishes to prepare.这个句子可以理解为定语从句吗？

The reason that he was ill yesterday is such a bad excuse.

划线部分为同位语从句。

The reason why his mother was late with dinner is that there were so many dishes to prepare.

划线部分为定语从句。