在高三课本第十五单元出现了下面几个句子:
1 As Kofi Anna,Secretary General of the United States said,each contribution -- how small -- can help make a difference.
2 Now she is spending a year in remote part of southwest China working as a volunteer teacher in a village school.
这几个句子都涉及到了as的用法。作介词用,第一句话中as用作关系代词,引导定语从句,含义为正如,第二句话中as的含义为作为,当作,做介词。
下面让我们结合历年高考试题对其用法进行分析。
一.用作连词引导让步状语从句
从句必须用倒装语序,把作表语用的名词或作表语的形容词,或动词,或副词提到as前面。如:
1.Child as he is,he knows a lot.
2.Tired as they were,they stayed up late preparing for the coming exams.
3.Try as he would,he failed again this time.
考例:1.___,he talks a lot about his favorite singers after class.
A.A quiet student as he may be
B.Quiet student as he may be
C.Be a quiet student as he may be
D.Quiet as he may be a student
【解析】答案是B。作表语的是名词student,名词前不加冠词。
2.____,Carolina,couldnt get the door open.
A.Try as she might B.As she might be C.She might as try D.Might she as try
【解析】答案是A。as引导让步状语,将动词原形try提到as前面。
二.用作关系代词,引导定语从句
as用作关系代词,引导定语从句,含义为正如。如:
1.He is very careful,as his work shows.
2.As is known is reported in the newspaper,talks between the two countries are making progress.
考例:___I explained on the phone,your re quest will be considered at the next morning.
A.When B.After C.As D.Since
【解析】答案是C。意思是正如我在电话里解释的那样。
2.The Beatles,____many of you are old enough to remember,came from Liverpool.
A.what B.that C.how D.as
【解析】答案是D。引导非限制性定语从句。
三.作为副词
用于表示和一样,的意思,asas中间要用形容词/副词的原级,如as long as:长达;as far as远达;as much as:多达;as tall as含义为高达。如:
That day they walked as far as ten kilometers in two hours.
考例:John is the tallest boy in the class,_______according to himself.
A.five foot eight as tall as B.as tall as five foot eight C.as five foot eight tall as D.as tall five foot eight as
【解析】选B.asas中间要用形容词/副词的原级。
四.引导时间状语从句
含义为当的时候,如:
1.I watched her as she combed her hair.
2.As he grew older ,he lost interest in everything except gardening.
考例:1.Mother was worried because little Alice was ill,especially____Father was away in France.
A.as B.that C.during D.if
【解析】答案是A.在时候,相当于when.而C选项是介词,不接句子。
2._____the day went on,the weather got worse.
A.With B.Since C.While D.As
【解析】答案是D.随着的意思,as the day went on可以作为固定结构记住。
五.作介词用
有作为,当作的意思。如:
1.They were all dressed as clowns.他们都打扮得如小丑。
考例:I feel that one of my main duties_____a teacher is to help the students to become better learners.
A.for B.by C.as D.with
【解析】选C。作为教师的意思。
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