reason 是否能引导同位语从句，如果不能那些表示原因的次可以引导？

reason后可以跟why引导的同位语从句，说明reason的内容。
eg: She asked the reson why there was a delay.
但在含"The reson why"同位语从句结构中，后面的表语从句只能用
that引导。
eg: The reson why they were always poor was that they paid
little attention to education.

可以引导如 The reason why i did not go to school is that i am sick

可以，The reason

可以引导同位语从句的

The reason why I was late for school is because I missed the bus.
我上学迟到的原因是没赶上车。

The reason 和 Why I was late for school是同指，称为同位语