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专业四八级-填空题常考结构 7

时间:2006-06-26 16:00:00

(单词翻译:单击)

十一、状语从句省略结构 Metals expand when they are heated. Metals expand 是主句;when they are heated 是状语从句。但是这个状语从句中可以省略掉they are, 句子变成:Metals expand when heated. 但是并不是所有的状语从句都可以这么省略。这种省略从句主语的方式理论上需要满足以下两个条件:

    第一、从句主语和主句主语必须保持一致;    第二、从句的谓语必须是be动词,主语和be动词同进同出,       比如上面的they和are要么同时省略,要么同时保留。


例1:Although___rigid, bones exhibit a degree of elasticity2 that enables the skeleton to withstand considerable impact.    (A) apparently3    (B) are apparently    (C) apparently their    (D) are they apparently 分析:连词although通常引导主谓完整的状语从句,当从句主语与主句主语相同、从句谓语又为系表结构时,则可省略主语和连系动词,故正确答案为(A)。Although apparently rigid1 = Although bones are apparently rigid, 注意bones和are必须同时省略。

因此,我们从上面的例题中来分析一下填空题中状语从句省略以后的形式:  though, although, even thought, while, If, when等为引导状语从句的词;  这些词后面一定+形容词(分词),主句(注意逗号的后面是主句,前面是从句)

例2:All marble is composed of crystals of the minerals calcite or dolomite, ___, are perfectly4 white.    (A) when, pure which    (B) when, which pure    (C) which, pure when    (D) which, when pure 分析:空格前是个完整的句子,空格后是系表结构,空格处显然缺非限定性定语从句的引导词兼作从句主语。(A)、(B)不引导非限定性定语从句,可首先排除。(C)中的pure和when位置错了,故选(D)。注意when pure是插入语,同时也是省略用法when they are pure;which are perfectly white, 状语从句省略结构,

例3:___relatively costly5, the diesel6 engine is highly efficient and needs servicing infrequently    (A) Even    (B) It is    (C) Even though    (D) There is 分析:B和D填入后,都是构成两个主句,不对;Even though则引导状语从句,even though it is, 这里it is 已经省略。


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