在SAT语法考试中有一个重要的考点就是逻辑主语，什么是逻辑主语?什么又是句子真正的主语呢?今天小编带领大家一起来学习一下SAT语法考点之逻辑主语。
逻辑主语和真正主语的区别
真正的主语是句子的主语，而逻辑主语是除了主句之外，另外的一个动作的发出者，有可能是句子的主语，也可能不是。
Walking in the street, he thinks a lot. (动词thinks和Walking的动作发出者都是he)
Time permitting, we will visit you. (句子的主语是we，谓语动词是visit，但是另一个主语是Time)
相关的结构：
1.悬垂结构
现在分词： doing
The boy is playing basketball.
过去分析：done
The boy was bitten by a dog.
那么什么是悬垂结构呢?
悬垂的英语表述是dangling,分词悬垂指的是分词在晃，这里的晃指的是分词与其逻辑主语的逻辑关系不成立，找不到自己在主句的黏着点。
例如：
(A) Writing in a free style, the novel is popular among the children.
(B) Written in a free style, the novelist is popular among the children.
句子中的逻辑主语novel和novelist和动词Writing和 Written的逻辑关系是不正确的。Novel是不能发出Writing这个动作的，而novelist也不能被写。
SAT语法考题中通常涉及分词在句中作状语，
现在分词与其逻辑主语之间是主动关系，过去分词与其逻辑主语之间是被动关系。
在SAT考试中，悬垂结构大概有3中考察形式：
1. doing/done ….., SVO.
2. While/when/by/on/through doing/done ….., SVO.
3. SVO, doing/done ….S与分词
SVO doing/done ….O与分词
1. doing/done ….., SVO.
例： Indicating their desire to extend free enterprise, Canadians elected a member of the progressive conservative party, Kim Campbell, as Prime Minister in 1993.
(A) Canadians elected a member of the progressive conservative party, Kim Campbell, as Prime Minister
(B) Canadians’ election of a member of the Progressive Conservative Party as Prime Minister was Kim Campbell
(C) Kim Campbell of the Progressive Conservative Party was elected Prime Minister of Canada
(D) the Progressive Conservative Party’s Kim Campbell was elected Prime Minister of Canadians
(E) a member of the progressive conservative party, Kim Campbell, was elected by Canadians as Prime Minister
答案：A
分析：句子当中的Indicating这个动作可以由Canadians主语发出，B答案中的主语是Canadians’ election，不能发出Indicating这个动作，C,D，E答案中的主语是Kim Campbell和句子中的their desire的单复数不一致，所以是错误的。
2. While/when/by/on/through doing/done ….., SVO.
While driving down the road, the house with the large yard and small pond attracted the family’s attention.
(A) the house with the large yard and small pond attracted the family’s attention.
(B) the house having the large yard and a small pond attracted the attention of the family
(C) the house with the yard and small pond was attractive to the family’s attention.
(D) the family’s attention was attracted by the house with the large yard and small pond
(E) the family was attracted to the house with the large yard and small pond
答案：E
分析：while 后面的动词driving和E选项中的逻辑主语the family符合逻辑关系一致。
3.SVO, doing/done ….S与分词
Students entered the classroom, following the professor.
SVO doing/done ….O与分词
During (A)my most recent (B)trip, I came across (C)wonderful antique store wandering(D)
in the old quarter of the city. No error (E)
答案：D
分析：antique store 和动词wandering够不成主谓逻辑关系一致，可以在wandering前面加上逗号。
特殊的考察形式：
prep.., SVO
例：Of all the states represented at the conference, the governor of Missouri was the only one to present plans for enforcing the new regulations.
(A) the governor of Missouri was the only one to present plans for enforcing the new regulations.
(B) Making the governor from Missouri the only one to present
(C) Missouri’s governor only represented
(D) Missouri’s governor presented the only
(E) Missouri was the only one whose governor presented
答案：E
分析：句子的前半句中的谓语动词是represented，能和它构成主谓逻辑关系一致的是Missouri。
以上就是今天小编为大家整理汇总的SAT语法考点中的逻辑主语，希望对大家的SAT备考有帮助。
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