如何判断名词性从句和让步状语从句？

Question

如题所述

Answer 1

主要看位置；eg.
Wherever(==No matter where) he appears, there are crazy crowds of girls wanting to see him. 让步状语，二个句子，其中由No matter where引导的是让步状语；
Wherever he appears is crowded with his fans(不能使用No matter where) ，名词性主语从句；Wherever he appears 充当主语成分，在主语位置。

Answer 2

答：让步状语从句属于状语从句，其引导词为从属连词，有though, although, while, wh-词ever (如however, whatever, whenever,wherever, whoever)= no matter how/what/when/where/who
而引导名词性从句的连词只有两个：that 和whether (if), 连接代词what, which, who, whom, whose, 连接副词：where, when, why, how 等等，与引导让步状语从句的从属连词没有交集。
至于它们在句子中的作用不同，不用我多说了吧。