GMAT，SC的句子改错是阅读部分占分比相对容易拿下的模块，但是对于不同的同学所掌握的基础差异，每每在练题SC句子改错时，常常忽略了重要而又简单的部分，那就是对SC进行结构分析。在练题的时候，快速地进行结构分析，这样的好处是帮助我们在练题时了解题目所给出的逻辑语义，快速找到SC的考点，做出正确的选择。
那么首先请各位同学跟着小编的步伐，来看看下面的这道题是如何进行结构分析的。
例题① ：Television programs developed in conjunction with the marketing of toys, which was once prohibited by federal regulations, are thriving in the free market conditions permitted by the current Federal Communications Commission.
A. Television programs developed in conjunction with the marketing of toys, which was once prohibited by federal regulations, are
B. Television programs developed in conjunction with the marketing of toys, a practice that federal regulations once prohibited, is
C. Developing television programs in conjunction with the marketing of toys, as once prohibited by federal regulations, is
D. Federal regulations once prohibited developing television programs in conjunction with the marketing of toys, but they are
E. Federal regulations once prohibited developing television programs in conjunction With the marketing of toys, but such programs are
好，我们来看下原题的句子主干部分；Television programs作为句子的主语来引导整个句子的方向；developed in conjunction with the marketing of toys这一部分则是修饰后置定语和介词短语 , which was once prohibited by federal regulations用which开头的非限定性定语从句和are thriving的谓语部分 in the free market conditions permitted by the current Federal Communications Commission.
原句的句子主干部分没有问题，用which开头的修饰部分按照语法进行指代，说的就是toys,但是从语义上来看，which指代Television programs才是合理的，因此我们看出，选项A是错误的。那么选项B的Television programs与is主谓不一致，而C选项as表原因，语义逻辑有问题，不是说因为曾被禁止过，才在free market thriving的。选项D but they are...这里they按语法应指代主句主语Federal regulations，然而这样逻辑语义错误，是television programs are thriving，不是Federal regulations.所以正确选项为E.
句子意思：联邦法规曾经禁止开发与玩具营销相关的电视节目，但在当前联邦通信会允许的自由市场条件下，这类节目正在蓬勃发展。
例题②：The effect of the earthquake that caused most of Port Royal to sink into the Caribbean was like the eruption that buried ancient Pompeii: in each case a slice of civilization was instantly frozen in time.
A. The effect of the earthquake that caused most of Port Royal to sink into the Caribbean was
B. As the result of an earthquake, most of Port Royal sank into the Caribbean; the effect was
C. In its effects, the sinking of most of Port Royal into the Caribbean was the result of an earthquake
D. The earthquake that caused most of Port Royal to sink into the Caribbean was ,in its effects,
E. Most of Port Royal sank into the Caribbean because of an earthquake ,the effect of which was
继续跟着小编的步伐来看看第2道例题：The effect（主语）of the earthquake that（修饰部分定语从句）Caused most of Port Royal to sink into the Caribbean was like (谓语) the eruption that（修饰部分定语从句）buried ancient Pompeii:（解释说明）in each case a slice of civilization was instantly frozen in time.
原句主干语法上没有问题，但是逻辑语义不合理，the effect和the eruption不可比，实际应是the earthquake和the eruption的比较，这里属于“偷换主语”，所以A选项错误。
B选项中，分号连接两个完整的句子，the effect was like the eruption that...错误同A选项。C选项中，In its effects，这里its指代不清，是指代sinking还是an earthquake，按语义应是an earthquake，但从语法结构看，应优先指代sinking。D选项the effect of which was...结构中，effect是核心词，同A，the effect和the eruption不可比。因此正确选项为E.
句意：地震导致皇家港口大部地区陷入加勒比海，就像埋葬了古老的庞贝古城的喷发一样：每种情况下，一片文明都被冻结了。

例题③：Much of the hope for continued improvement of the economy lies in the projection of increasing consumer spending this year.
A projection of increasing consumer spending
B projection of consumers increasing spending for
C projected consumer spending increase
D consumer spending that is projected to increase
E increase in consumer spending that is projected for
解析：分析原句主干，找主谓宾hope lies in__ 选项：projection/consumer spending/increase这里考察逻辑语义，宾语应该用谁才符合逻辑语义，经济改善靠的肯定不能是预测和顾客消费，而应该是顾客消费的增加，核心词在增加，所以应该是选E。
看完以上三道题，不知道同学有没有掌握SC句子改错结构分析的重要性呢？结构分析不仅是我们SC句子改错的重要一步，它能够帮助我们快速认识到句子的逻辑语义错误以及句子缺失的部分，大大提高我们练题的正确率。好了，希望通过本次小编的实例讲解，每个同学都能了解到SC句子结构分析的重要性，并且顺利考出GMAT高分。