关系代词as与which的区别.ppt

关系代词as与which的区别 as 和which的相同点 (1) as 和which都可引导非限制性定语从句，放在主句之后；在非限制性定语从句中充当从句的主语、宾语或表语。如： Tom has found a good job, as / which we all hope. 汤姆找到了一件好工作，这正是我们大家所希望的。 (2) as 和which都可代表整个句子的内容或主句中的某一成分。如： His mother is ill, which makes him very sad. 他母亲病了，这件事情使他很难过。 He has made great progress, as / which we all knew. 我们都知道他进步了。 以上两句中的as / which都指前面整个句子的内容。 as与which的区别 (1) 当先行词前面有so 、such、the same等词修饰时，引导词只能用as，而不用which。如： She is so nice a girl as we all like. 她是个我们大家都喜欢的如此好的女孩。 It is such an interesting book as we all want to read. 它是本我们大家都想读的有趣的书。 上面两句中的as就不能用which替换。 （2）用能做关系代词，as和which都可以指代一个句子，但as有“正如”、“就像”之意，which则没有此含义。 He is a foreigner, as I know from his accent. (as指代一个句子，意为“正如”、“就像”) He has to work on Sunday, which he doesn’t like. (which指代一个句子，没有“正如”、“就像”) (3) 当关系代词仅代表主句中单个的名词时，一般只用which, 而不用as。如： He sent me a beautiful present, which I valued very much. 他给寄来了一件精美的礼物，我对它非常珍视。 ?(4) 当非限制性定语从句放到主句的前面时，引导词只能用as，而不用which。如： As is planned, we got there before eight. 正如计划，我们再把店前到达了那儿。 （5）当从句的谓语动词是be或相当于联系动词的seem, become等时，可用as或which作主语。但当从句的谓语是行为动词时，只能用which作主语。例如： He married her, as /which was / seemed natural. He saw the girl, which delighted him. (6) as常用于一些固定结构以及被动态结构中。如： as is well known / as we all know 众所周知；as is said above 正如上面所说；as might be imagined 正像所想象的那样； as is reported 如报道所说； as has been pointed 如所指出的那样； as is expected 正如所料 (7) ：which 代表整个句子，还可用于in which case, at which point, on which occasion等。如： I may have to work late, in which case I’ll telephone you. 我可能得晚点下班，那样我会给你打电话的。 * *