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所谓垂悬结构（The Dangling Construction）就是一个句子成分，如分词短语，不定式动词短语等，找不到被修饰的主语或被修饰的对象不合逻辑。垂悬结构是种错误的句法，应该避免。 下面是三种常见的垂悬结构及其改正方法： ⒈垂悬分词或分词短语，如： ① Climbing up the hill, several boars were seen. 这句子里的现在分词短语（present participial phrase）修饰主语several boars是错的；改正方法有二： （a）确定是逻辑主语，使句子变成Climbing up the hill, the explorers saw several boars. （b）把现在分词短语扩大为副词分句（也称状语从句）：When the explorers climbed up the hill, they saw several boars/ several boars were seen. ⒉垂悬副词短语，如： ② After putting a shrimp on the hook, the fish began to bite. 这句的副词短语（adverb phrase）和主语the fish有什么逻辑关系呢？真正的逻辑主语应该是the fisherman或the angler才对。改正方法和例①同： （a） After putting a shrimp on the hook, the fisherman found that the fish began to bite. （b） After the fisherman had put a shrimp on the hook, the fish began to bite. | 
