分詞作狀語，它的邏輯主語通常應(yīng)是句子主語，否則會(huì)出錯(cuò)。請(qǐng)看下例。如：

　　(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

　　此題答案應(yīng)選D，因?yàn)榫涫子米鳡钫Z的現(xiàn)在分詞短語finding her car stolen 的邏輯主語應(yīng)是她，而不是 a policeman, the area, it 等。

　　在使用分詞的邏輯主語時(shí)還要注意根據(jù)句意判斷是主動(dòng)還是被動(dòng)，如：

　　(2) _____ many times, he still didnt understand it.

　　A. Having been told B. Though to be told

　　C. Having told D. He was told

　　根據(jù)句意，he 與 tell 應(yīng)是被動(dòng)關(guān)系。從時(shí)間上看，應(yīng)該是被告訴在先，沒有理解在后，故選A。比較下題由于句中用了并列連詞but，情況有所不同。如：

　　(3) _____ many times, but he still didnt understand it.

　　A. Having been told B. Though he was told

　　C. To have been told D. He was told

　　此題答案選D，句中的并列連詞 but 表明整個(gè)句子為并列句，同時(shí)表明 but 前應(yīng)是一個(gè)獨(dú)立的句子，而不能是一個(gè)非謂語動(dòng)詞短語(所以不能選A或C)。