麻烦帮我分析这个定语从句的成分：the reason why she was ill was that she had eaten bad meat。

Question

这貌似是由why和that分别引导的定语从句，the reason在从句中做状语，但是我搞不清楚哪个是哪个，麻烦说仔细点，最好把先行词还原在从句中，谢谢！！

Answer 1

本句的主句：The reason(主语） was（系动词） that she had eaten bad meat（表语）.
why she was ill是定语从句，修饰the reason 。什么样的原因，即：她生病的原因。

Answer 2

the reason why he was ill 是定语从句作主语， was 是谓词， that 引导了一个从句 she had eat ed bad meat.,解释了生病的原因。追问

那that引导的是不是定语从句呢？还是只是一个简单从句？

Answer 3

why引导定语从句，修饰the reason 。that引导表语从句，be动词后接表语，the reason why she was ill 做表语从句的主语