在SAT语法修饰成分错误中主要有两种类型。一种是修饰词放置的位置不当导致歧义，另一种是错误修饰导致的悬垂结构，下面我们一起来学习一下SAT语法错误之悬垂结构。
Dangling Modifiers：
当一个修饰短语和从句位于主句之前时，这些修饰成分应该位于主句的主语之前，就能清晰的指代主语，但是如果修饰成分放在了句子的错误位置，那么就会产生一种悬垂结构，这个句子就会产生意义混乱。
要修改这种错误的表达方式，可以将句子的主语和它的修饰词进行调整，有时也需要增加一些词来明确句子的意思。
例子：
悬垂分词结构：
Walking down the Yellow Brick Road, the Castle of Great Oz was seen.
(这个句子中的逻辑主语是the Castle of Great Oz，很显然它是不能发出走这个动作的)
修改后：
Walking down the Yellow Brick Road, Dorothy and her companions saw the Castle of Great Oz.
注意包含动名词和不定时的悬垂结构：
动名词形式的悬垂结构：
Upon hearing the report that a troll had been found in the cellars, the building was cleared.
(这个句子的逻辑主语是the building，是不具有听的能力的)
修改后：
Upon hearing the report that a troll had been found in the cellars, the headmaster cleared the building.
不定式形式的悬垂结构：
Unable to defeat the Trojans in open battle, a trick was resorted to by the Greeks.
(同样的，这个句子的逻辑主语是trick，是不能发出defeat这样的动作的)
修改后： Unable to defeat the Trojans in open battle, the Greeks resorted to a trick.
下面我们一起来看看例题吧
例题1：
Returning to Harvard after three decades, the campus seemed much less cheery to Sharon than it had been when she was studying there.
(A) Returning to Harvard after three decades, the campus seemed much less cheery to Sharon
(B) After Sharon returned to Harvard in three decades, it seemed a much less cheery campus to her
(C) Having returned to Harvard after three decades, it seemed a much less cheery campus to Sharon
(D) When Sharon returned to Harvard after three decades, she thought the campus much less cheery
(E) Sharon returned to Harvard after three decades, and then she thought the campus much less cheery
答案：D
解析：这个句子中的逻辑主语是Sharon，是她回到Harvard，而不是the campus，因此正确的选项是D
例题2：
Having drafted the museum floor plan with exceptional care, that the planning commission rejected his design upset the architect greatly.
(A) that the planning commission rejected his design upset the architect greatly
(B) the planning commission’s rejection of his design caused the architect a great upset
(C) the architect found the planning commission’s rejection of his design greatly upsetting
(D) the architect was greatly upset about the planning commission rejecting his design
(E) the architect’s upset at the planning commission’s rejection of his design was great.
答案：C
解析：这个句子中未划线部分的动词显然是人发出的动，不可能是the planning commission，因此主语应该是architect，所以只有C和D符合条件，但是D选项中的rejecting是动名词的形式，因此它前面应该用所有格的形式the planning commission‘s rejecting.
以上就是小编为大家介绍的SAT语法改错之悬垂结构，希望对大家的SAT备考有帮助。
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