Whatever is worth doing at all is worth doing well.whatever是做代词也做引导词么

题目

Whatever is worth doing at all is worth doing well.whatever是做代词也做引导词么
at all在从句中的成分吧 介宾么?

答案

说得对,whatever在这里,既是代词,也是主语从句的引导词.
at all在这里是“根本”的意思,加强语气的作用.是固定短语,不属于介宾结构.