as /which引导非限制性定语从句.
引导词as和which的区别在于:
①as引导的非限制性定语从句可放于主句前、主句中、主句后,而which引导的非限制性定语从句一般放于主句后或句中.as放在句首的情况常用的句式 有as we all know,as is mentioned above,而which我们则看不到这样用于句首的情况.
②as常与从句中的know,see,hear,expect等动词连用,也常用于as often happens,as is often the case(常有的事)等句子中;而which一般不用于以上情况.
③as有“正如”的含义,which没有此含义.如:
As is well known,Shanghai is a big city.
Some of the roads were flooded,which made our journey more difficult.
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