有這樣一道題：
    The murderer was brought in, with his hands _________ behind his back.
    A. to be tied
    B. being tied
    C. tied
    D. having tied
    【分析】答案為C。從意義上看，hands 與 tie 的關(guān)系應(yīng)屬被動關(guān)系，故排除D。在A、B、C三個選項中，選項A比較容易排除，因為不定式表示將來意義，在此與語境不符。
    現(xiàn)將B和C作一比較：
    B為現(xiàn)在分詞的被動式，它表示兩層意義，一是表被動，二是表進(jìn)行，也就是說 his hands being tied 的實際意思是“他的手正在被捆住”，這顯然與語境不符。
    C為過去分詞，它也表示兩層意義，一是表被動，二是表示動詞的完成或完成后的狀態(tài)，此句中的 with his hands tied behind his back 可視為手被捆在背后的一種狀態(tài)。由此可知答案為C。
    請看下面一題：
    Anyone _________ trying to take knives on heard flights would be caught by the police.
    A. finds
    B. found
    C. being found
    D. will find
    答案選B而不選C，其中的過去分詞表示被動和完成。
    比較下面兩題，答案是D不是A，現(xiàn)在分詞的被動式表示被動和進(jìn)行：
    (1) The court hears about 120 cases a year; visitors are welcome to see a case _________.
    A. argued
    B. to be argued
    C. to be arguing
    D. being argued
    (2) The silence of the library was sometimes broken by an occasional cough or by the sound of pages _________.
    A. turned
    B. having turned
    C. to be turned
    D. being turned