在非限制性定语从句的诸多引导词中,as绝对是一个特殊的存在。它可以与which一样引导一个非限制性定语从句,修饰前面的名词,既可以指代物也可以指代人。在非限制性定语从句中的用法对初学者来说较难理解。请看下面例句。 例1:(2013陕西)________is often the case, Amy was better by the time the doctor arrived. A. It B. That C. What D. As 解析:答案选D。情况经常是这样,等医生到达的时候艾米已经好多了。居中的as引导非限制性定语从句,它指代后面的一整个句子,意思是这种情况经常发生。题目并没有把which作为选项之一,可能是为了降低难度。即使有which,也不能选。因为which只能放在被修饰词后面,而as引导的非限制性定语从句的位置很灵活,可以出现在主句的前面、后面或者插在主句中间。 例2:(2015江苏) Thenumber of smokers, ________ is reported, has dropped by 17 percent in just oneyear. A. it B. which C. what D. as 解析:答案选D。正如报道的那样,抽烟者的数量仅在一年内就下降了百分之十七。as代指一个整句,即:The number of smokers has dropped by 17 percent in just one year.而且as可以翻译为“正如”。 例3:(2013山东)There isno simple answer, ________ is often the case in science. A. as B. that C. when D. where 解析:答案选A。as is oftenthe case 是一个常用的句型。 例4:Theexpression “gelivable” has enjoyed so much popularity in the past years, ________has been collected into Modern Chinese Dictionary. A. that B. which C. as D. when 解析:答案选B。“给力”这个词最近几年特别的火,它已经被收入现代汉语词典了。which代指主句的主语the expression “gelivable”。as不可以用,因为它“正如”的意思放在这里不合适。 例5:There are 12hospitals in this area, everyone of __________ has a special department for COVID-19 patients. A. that B. which C. as D. when 解析:答案选C。当前面有介词短语修饰的时候,不可以使用as,只能使用which指代物。 我们从上面的题目里面不难总结出:which引导的非限制性定语从句只可以放在被修饰的部分后面,但是which前面有东西修饰它。as引导的非限制性定语从句则可以放在主句前,主句后或主句中间,但是as前面不可以有任何修饰词。另外,as可以表达“正如…”的意思,which没有这个意思。 有想法的朋友,留个言吧? |
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