as与which
一、语义上的区别

as用作关系代词时,它或多或少仍保留有“比较”“方式”“等同”等含义;而which则没有。as通常可译为“如同……那样”,它所指代的既然是主句全部或部分内容,它所引导的从句在含义上通常就不可和主句内容相悖,而which引导的从句则无此限制。

Mummy treats me just like a baby, which (不可用as)I can’t bear.

二、结构上的区别

从句的结构为“主语+系动词+表语”时,as和which皆可用作表语;从句结构为“主语+vt.+宾语”时,as只可用作宾语,不可用作主语,而which则既可作主语,也可作宾语。若从句结构为“主语+vi.”,which和as皆可作主语。

They rushed to our help, as (或which)was exactly what we expected.

He made the acquaintance of some famous scientists at the meeting, which (不可用as)delighted him.

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