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which与as在定语从句中的不同用法

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  下面是小编整理的一些关于which与as在定语从句中的用法,希望帮助大家区分这两个单词。提高英语水平。

  which与as在定语从句中的不同用法

  一、which与as用法相同点

  1. as和which都能引导定语从句,并都可以在定语从句中做主语或宾语,代表前面整个句子

  例 1 He married her, as / which was natural. 他跟她结婚了,这是很自然的事。

  例 2 He is honest, as we can see. 他很诚实, 这一点我们看得出来。(表示人们从日常主观常识, 经验对某一事情的看法、评价,用as为妥。)

  2. 当非限定性定语从句置于句末时,as和which都可用来引导这个定语从句。

  例 3 The number of senior high school students is increasing, as is mentioned above. (as引导非限定性定语从句,意思是“正如”。此时也可以换用which引导,但意思有别,意思是:“这一点上面提到了”。)

  二、which与as用法不同点

  (一)语义上的区别

  as作为关系代词仍多少保留 “理由”“比较” “方式” “等同”等意义,而which没有这些意义。因此,由as引导的定语从句通常在意义上不可与主句相悖,而且一般是肯定的,对主句意义起相辅作用,表示 “正如”等意义;而which引导从句则不受此限制。

  例 4 Mother treats me just like a baby,which I can’t bear. 妈妈对我就像小孩,我真受不了。

  例 5 She has married again,which was unexpected. 她又结婚了,这是大家没有预料到的。

  上面两句中的which都不宜用as。

  但当否定的定语从句作正面理解,对主句起相辅作用而不是与其相悖时,仍可用as。

  例 6 He turned his eyes on Philip’s face,as he had not done for ten years.他转过身来看着菲利普的脸,他十年来没有这样看过他的脸了。

  例 7 He really can’t lend you the money,as you might not realize. 他的确不能把那些钱借给你,这一点你可能意识不到。

  (二)用法上的区别

  1. which与as引导非限制性定语从句的区别:

  (1)which只能放在主句后面,而as引导的从句位置相对比较灵活,可以放在前,也可以放在后,甚至还可以分割主句。另外,as 常常有“正如、正像”的含义。

  例 8 As he realized, I was very useful to him.(在前)

  例 9 Air, as we know, is a gas. (在中)

  例 10 He was a foreigner, as I know from his accent. (在后)

  例 11 He came late again, which made his boss angry.(在后)

  例 12 As is known to all, China is a developing country. 众所周知,中国是发展中国家。

  (2)在which引导的定语从句中,谓语动词若是am, is, are,则这些系动词不能省略,而as后面若是这种情况,则可以省略。

  例 13 He is a teacher, as (is) clear from his manner. (is可以省略)

  例 14 He said he had never seen her before, which was not true. (was 不可省略)

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