SAT语法知识点例题解析之逻辑主语!SAT语法考试中有三种题型分别是句子改进、句子改错和段落改错。不同的题型破解方法不同，需要我们了解方法之后通过练习来熟练的掌握，下面为大家介绍常考的SAT语法知识点之逻辑主语，详细的内容介绍详见正文。

SAT考试中考察逻辑主语这一语法知识点的考察形式是怎样的呢?逻辑主语考点上常见的致错因子又有哪些呢?

1. 考查“逻辑主语”的一般思路

先出现ing分词, 或ed分词，或同位语，或时间状语，或比较对象，然后来让考生判断其针对的对象是谁，是人或物;这种句子结构一般比较简单，可以是：-ing, SVO，-ed, SVO，Like/unlike/ compared with …., SVO，When/while –ing, SVO，When/ while –ed, SVO，One of /As a ….., SVO，(SVO 代表主谓宾)

2. 逻辑主语考点上常见的致错因子：句式变化

1)句式颠倒

Tomato soup appeals to all age groups and can be made particularly delicious if adding sweet red peppers.

B) delicious by the addition of

2)主从句的认知错误

The agency reports that by rigorously enforcing state regulations, industrial pollution has been successfully reduced to acceptable levels.

(A) industrial pollution has been successfully reduced to acceptable levels

(B) a reduction of industrial pollution to acceptable levels has succeeded

(C) they have succeeded to reduce industrial pollution to acceptable levels

(D) it has succeeded in reducing industrial pollution to acceptable levels

在that 之前，主句部分已经结束，由that带起从句，而从句中有一个by doing 形式的结构(by enforcing state regulations), 做enforce这个动作的主语只可能是人或者组织，工业污染或其减少都不可能自己实施规章制度，因此答案锁定在C和. 再细看之前主句的主语为agency, 单数，因此答案选择D(it 指代agency.) 此处也是提醒同学切勿觉得翻译顺畅就没头脑地选择了A选项!