出国留学首选一诺留学

　　一、省略结构要注意哪些

　　1) 两个句子并列,第一个句子含有be动词或者become,第二个句子中的be动词或者become必须省略,同时,一些重复的名词或形容词也必须省略。例如:Once the economic and social usefulness of the motor was demonstrated and its superiority to the horse proved, ... (proved前省略了was)

　　2) 注意:be able/unable to是be动词短语,在这个短语中be动词不是助动词,不能省略!例:A president entering the final two years of a second term is likely to be at a sever disadvantage and is often unable to carry out a legislative program.

　　3) 并列结构的省略：

　　A. 省略相同的主语、宾语、联系动词、助动词、情态动词sb.do…and(sb.)do…;sb. do(sth.) and do sth.;sth. be A and (be)B;be doing ...and doing…;be done and done;have done …and done…;will do …and do…;must/would/should/can/could/may do …and do…

　　B. 两个句子并列,主语和系动词结构相同,第二个句子的主语和系动词必须省略 about whether obesity is a biological disorder posing serious health risks or (it is)a condition more related to appearance than to health.

　　4) 省略结构一定要能还原:indicate there is one when it is not中,状语从句when it is not省略的表语无法还原,也就是说状语从句不能按语法承接there is one省略。正确说法indicate that it is present when it is not或 indicate there is one when there is not.

　　5) 习惯性省略：consider sth. Sth.;consider sth. Adj.;prove adj.

　　二、GMAT对于省略的考察

　　在很多例子中我们发现，对于比较常常会将第二部分的比较词进行舍去。常见的省略形式之一是将比较的第二个所有格后的名词省略：

　　◆ My car is bigger than Brian’s [car].

　　◆ My car is bigger than Brian’s [car].

　　◆ My car is bigger than the Smiths’ [car].

　　◆ My toes are longer than Brian’s [toes].

　　◆ My toes are longer than the Smiths’ [toes].

　　对于省略我们也可以将比较第二部分中的动词，词组，甚至一整个句子省略，当然前提是不会造成歧义。

　　◆ Whereas I drink 2 quarts of milk a day, my friend drinks 3 [quarts].

　　◆ I walk faster than Brian [walks].

　　◆ I walk as fast now as [I walked] when I was younger.

　　而有时为了避免产生歧义我们也会加入助动词，如be ,do 和have 等：

　　◆ Ambiguous: I like cheese more than Yvette. (Yvette could be subject or object.)

　　◆ Right: I like cheese more than Yvette DOES. (= than Yvette likes cheese)

　　◆ Right: I like cheese more than I DO Yvette. (= than I like Yvette)

　　而在GMAT考试中，有时也容许不需要的助动词的存在：

　　◆ Right: Apples are more healthy to eat than caramels.

　　◆ Right: Apples are more healthy to eat than caramels ARE.

　　所以在考试中，我们不要因为多余的助动词而排除了正确的选项。

　　三、真题解析

　　The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan.

　　(A) even a greater significance for the economy than

　　(B) a significance that is even greater for the economy than

　　(C) even greater significance for the economy than have

　　(D) even greater significance for the economy than do

　　(E) a significance even greater for the economy than have

　　考察比较中的省略结构。

　　也就是than后面到底是没有助动词，还是加do,或者是have。首先than后面如果有助动词的话，必然是事情和事情的比较，也就是句子间的比较，GMAT语法如果没有助动词就是than前后名词的比较。GMAT考试Do 和have的取舍在于前面的时态，如果前面是一般时态就用do的形式，如果前面是完成时就用have的形式。

　　这里很显然是事情和事情的比较(principles 和particulars各自have significance的比较)所以需要助动词，因为前面是一般时态，GMAT入门生都知道所以用do,选择D另外，significance是不可数名词。

　　以上就是关于GMAT语法省略用法讲解的内容介绍，同学们如果还有任何关于出国留学的问题，可以拨打一诺留学的免费热线400-003-6508或者010-62680991进行咨询，或者点击一诺留学官方网站http://www.yinuoedu.net/页面的“在线咨询”与一诺留学专家直接对话。微信订阅号：留学圈 (微信帐号：yinuoliuxue )