关系代词as和which在非限制性定语从句中到底有什么相同点和不同点,这是同学们在做题时感到头痛的问题。本文总结它们的三个相同点和四个不同点。1.as和which都可以在SVP(主语+动词/系动词+表语)或SV(主语+谓语)结构的非限制性定语从句中作主语,此时两者可互换。如:He said he had fallen sick,which/as was really true.他说他生病了,这是真的。The river was frozen again last winter,which/as is often the case in this district in winter.相同点 What are the similarities and differences between the relational pronouns as and which are non-restrictive attributive clauses? This article summarizes their three similarities and four differences. 1.as and which can both be subject in non-limiting attributive clauses of SVP (subject + verb / system verb + idiom) or SV (subject + predicate) structure, in which case the two are interchangeable. He said he had fallen sick, which / as was really true. He said he was sick, this is true. The river was frozen again last winter, which / as is the case in this district in winter