一、which与as引导非限制性定语从句的异同1.相同点which和as都可以指代主句中的一部分或整个主句的内容,有时可以互换。当which和as指代前面的整个句子或前句中的部分内容,且在定语从句中作主语时,谓语动词要用单数。如: First, which and as guide the similarities and differences between non-restrictive attributive clause 1. The same point which and as can refer to the main part of the sentence or the contents of the main clause, sometimes interchangeable. When which and as refer to the whole preceding sentence or part of the preceding sentence, and the subject in the attributive clause, the predicate verb must use the singular. Such as: