昂立外语暑假英语培训：http://www.onlycollege.com.cn/Thematic/20150529sjb/ 高中英语语法分词的逻辑主语（一）
一、何谓分词的逻辑主语
分词属非谓语动词，即不用作谓语的动词，所以它没有真正的主语。但是，分词作为动词的一种形式，它应有自己理论上或逻辑上的主语，即逻辑主语。如：
I often hear him singing this song. 我经常听他唱这首歌。(him 是singing的逻辑主语) Hearing the news, he couldn’t help crying. 听到这消息，他禁不住哭了。(he是hearing的逻辑主语)
若用的是过去分词或现在分词的被动式，则上面提到的逻辑主语实为“逻辑宾语”。如： I often hear this song sung. 我经常听到有人唱这首歌。(this song是sung的逻辑主语，但是sing 的逻辑宾语)
I saw her being taken to the operating room. 我看见她被送到手术室。(her是being taken 的逻辑主语，但是take 的逻辑宾语)
二、使用分词逻辑主语的易错点
分词作状语，它的逻辑主语通常应是句子的主语，否则会出错。请看下题： 1. Finding her car stolen, ______. A. a policeman was asked to help B. the area was searched thoroughly C. it was looked for everywhere D. she hurried to a policeman for help
此题答案应选D，因为句首用作状语的现在分词短语finding her car stolen 的逻辑主语应是“她”，而不是 a policeman, the area, it 等。
昂立外语暑假英语培训：http://www.onlycollege.com.cn/Thematic/20150529sjb/ 在使用分词的逻辑主语时还要注意根据句意判断是主动还是被动。如： 2. _____ many times, he still didn’t understand it. A. Having been told B. Though to be told C. Having told D. He was told
根据句意，he 与 tell 应是被动关系。从时间上看，应该是“被告诉”在先，“没有理解”在后，故选A。比较下题由于句中用了并列连词but，情况有所不同： 3. _____ many times, but he still didn’t understand it. A. Having been told B. Though he was told C. To have been told D. He was told
此题答案选D，句中的并列连词 but 表明整个句子为并列句，同时表明 but 前应是一个独立的句子，而不能是一个非谓语动词短语(所以不能选A或C)。