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悬挂结构，也叫悬垂结构，有些时候也叫做逻辑主语，是指我们要根据句首出现的状语和同位语等来考虑句子主干主语的情况。一般来讲，此种题难度不大，解题的关键在于学生是否能看出来这个考点。下面介绍常见的前几种悬挂结构的考法：
1.结构：n., S.V.O
方法：利用前面的同位语来找后面的主语。
要点：要保证主语跟前面的名词是同一类事物且不能是代词。
举例：
Once a popular form of entertainment in arcades, shops, and saloons across the United States, collectors prize coin-operated mechanical games as emblems of the nation’s past.
(A). NO CHANGE
(B). collectors who prize coin-operated mechanical games
(C). coin-operated mechanical games that are prized by collectors
(D). coin-operated mechanical games are prized by collectors
答案：选D。前半句是同位语(从once到states)，核心名词是“a popular form of entertainment”，因而后面的主语也必须是一种娱乐活动，所以AB主语不对，C没有动词不是句子，选D。
2.结构：adj., S.V.O
方法：利用前面的形容词做状语来找后面的主语。
要点：要保证前面的形容词能修饰到后面的主语。
举例：
Mindful of the growing popularity of backyard compost piles among home gardeners, experts warn that adding meat, dairy products, or cooking grease to compost will attract vermin.
(A). NO CHANGE
(B). adding meat, dairy products, or cooking grease to compost,this is what experts warn will
(C). and with warnings from experts that adding meat, dairy products, or cooking grease to compost will
(D). warnings from experts concerning the addition of meat, dairy products, or cooking grease to compost will
答案：选A。“mindful of”，意思是注意的，留心的。所以后面的主语需要是人。因而智能选A。
3.结构：done., S.V.O
方法：利用前面的过去分词做状语来找后面的主语。
要点：要保证前面的过去分词能修饰到后面的主语。注意过去分词一般表示被动修饰。
举例：
Selected as an astronaut by NASA in 1990, over 719 hours in space were spent by Dr. Ellen Ochoa on three flights by 2001.
A.NO CHANGE
B. by 2001, and on three flights, Dr. Ellen Ochoa spent over 719 hours in space
C.three flights and 719 hours were spent by Dr. Ellen Ochoa in space by 2001
D.Dr. Ellen Ochoa had spent over 719 hours in space on three flights by 2001
答案：选D。因为前面的过去分词“selected”表示的“被选举作为一名astronaut”，所以后面的主语需要是人，因而我们就只能选择D。
4.结构：doing., S.V.O
方法：利用前面的现在分词做状语来找后面的主语。
要点：要保证前面的现在分词能修饰到后面的主语。注意现在分词一般表示主动修饰。
举例：
Carefully reading the manuscript, numerous grammatical errors were detected by the copy editor.
A.NO CHANGE
B.the copy editor detected numerous grammatical errors
C.the reading of the manuscript by the copy editor
D.numerous grammatical errors was detected by the copy editor
答案：选B。因为此题的前面出现了现在分词“reading”，所以这个reading只能主动修饰人，所以只能选B。
以上是前几种比较常见的悬挂结构的语法考点。那么，现在的问题是，同学们怎么样才能立刻看出这个题的考点是悬挂结构呢?步骤如下：
1.审查该题是否有题干，一般悬挂结构的题都是只会出现选项的;
2.观察选项之间的差别，如果出现主语宾语等位置的呼唤，且每个选项的意思较为相同的时候，此题就有可能考到悬挂结构;
3.带入到原文的那句话当中来检验，那么做这步的前提就是要先熟悉悬挂结构的结构特点，所以就把前面我们总结过的考点都看一看。