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:
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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