as 和which 的用法

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,2012/8/12,#,as,和,which,在定语从句中的用法,定语从句是高一英语的主要语法项目之一，也是高考英语的常考知识点，尤其是,as,和,which,引导的定语从句，更是历年高考试题中的考点和热点。,as,和,which,都能引导定语从句，那么它们的共同点和区别是什么呢,?,一、,as,和,which,都能引导的定语从句,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。例如：,Dorothy was always speaking highly of her role in the play, _ , of course, made the others unhappy.,A. who B. which C. this D. what,答案是,B,。,which,引导非限定性定语从句，指代前面主句的内容，定语从句部分意为：这当然使别人不高兴。这里不能换用,as,作引导词，因为我们不能说,“,正如使别人不高兴,”,。,The number of senior high school students is increasing, _ is mentioned above.,A. that B. it C. such D. as,【,简析,】,答案是,D,。,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，意为：这一点上面提到了。,二、只能用,which,引导的定语从句,1.,在限定性定语从句中。例如：,The project _ a British businessman has invested in is under construction at present.,A. which B. as C. what D. why,【,简析,】,答案是,A,。单个词引导限定性定语从句时，一般不用,as,。当然，本题中的定语从句也可以使用,that,引导；由于关系词在从句中作宾语，,which,和,that,都可以省略。,2. “,介词,+,关系代词,”,引导定语从句时，只能用,which,。例如：,Recently I bought an ancient Chinese vase, _ was very reasonable.,A. which price B. the price of which,C. its price D. the price of whose,【,简析,】,答案是,B,。此时的,which,不能用,as,来代替。另外还应注意：引导定语从句时，,which,不能单独作定语，此时不管先行词是人还是物，都只能用,whose,引导，但指物时，可以与,of which,替换,(,如本题,),。,3.,当后置的非限定性定语从句是否定结构时，只能用,which,引导。例如：,The result of the experiment was very good, _ we hadnt expected.,A. when B. that C. which D. what,【,简析,】,答案是,C,。由于非限定性定语从句是否定结构，只能用,which,引导，不能用,as,来替代,which,。,三、只能用,as,引导的非限定性定语从句,1.,置于句首时，非限定性定语从句只能用,as,引导。例如：,_ is known to everybody, the moon travels round the earth once every month.,A. It B. As C. That D. What,【,简析,】,答案是,B,。,As,在定语从句中作主语，这里不能换成,Which,。,2.,在,the same.as,结构中，意思是,“,像,那样的,”,。例如：,Chongqing is not the same city _ we have seen in other places.,A. that B. which C.,不填,D. as,【,简析,】,答案是,D,。,as,在定语从句中作,have seen,的宾语。,the same . that,的意思是,“,正是,；就是,”,。注意：,as,不能省略。,3.,在,as.as,结构中，意思是,“,像,那样的,”,。例如：,No period in history has had as many important changes _ have taken place in the past century.,A. which B. as C. that D. what,【,简析,】,答案是,B,。,as,引导定语从句并在从句中作主语。,Exercises :,1.,1. _ has been announced, we shall have our final exam next month.,A. That B. As C. It D. What,2. The weather turned out to be very good, _ was more than we could expect.,A. what B. which C. that D. if,3. In the office I never seem to have time until after 5:30 pm, _ many people have gone home.,A. whose time B. that,C. on which D. by which time,4. Mathilde had to work hard day and night and bought such a diamond necklace _ she had lost to pay back to Jeanne.,A. as B. that C. which D.,不填,5. Robert, is this yours?,Yes, its just the same Walkman _ I lost on the playground yesterday.,A. which B. what C. as D. that,