一、which和as引导非限制性定语从句时的区别1.由as引导的非限制性定语从句可位于主句的前面、中间或后面,而which引导的非限制性定语从句只能放在主句的后面。如:As she realized,he was very important to her.正如她意识到的,他对她而言非常重要。Water,as everyone knows,is a liquid.众所周知,水是液体。All that glitters is not gold,as we know. First, which and as guide the distinction between non-restrictive attributive clause 1. As directed by the non-restrictive attributive clause can be located in front of the main clause, in the middle or back, and which guide the non-restrictive attributive clause can only be placed on the main Behind the sentence As she realized, he was very important to her. As she realized, he was very important to her. Water, as everyone knows, is a liquid. As is well known, water is a liquid. All that glitters is not gold, as we know