the reason why i was late is that i was ill

题目

the reason why i was late is that i was ill
这里面why引导的是定语从句,that 引导的表语从句,我迟到的原因是我生病了,

答案

对,
the reason is XX.
the reason why i was late（定语从句） is that i was ill（表语从句）
我迟到的原因是我生病了!