I often hear him singing this song. 我經常聽他唱這首歌。(him 是singing的邏輯主語)
Hearing the news, he couldn’t help crying. 聽到這消息，他禁不住哭了。(he是hearing的邏輯主語)
I often hear this song sung. 我經常聽到有人唱這首歌。(this song是sung的邏輯主語，sing 的邏輯賓語)
I saw her being taken to the operating room. 我看見她被送到手術室。(her是being taken 的邏輯主語，take 的邏輯賓語)
(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
此題答案應選D，句首用作狀語的現在分詞短語finding her car stolen 的邏輯主語應是“她”，而 a policeman, the area, it 等。
(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
句意，he 與 tell 應是被動關系。從上看，應該是“被告訴”在先，“理解”在后，故選A。下題句中用了并列連詞but，情況不同：
(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
此題答案選D，句中的并列連詞 but 表明整個句子為并列句，表明 but 前應是獨立的句子，而是非謂語動詞短語(選A或C)。
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