句子一：One of Mary's prize possessions was a little white lamb which her husband had given her. 　　

此句中定語從句的過去完成時不能換成一般過去時，因為 give 這個動作先于謂語之前發生。若用一般過去時則會發生混亂。　　

句子二：It was obvious that the lamb had been stolen.　　

此句 that 引導的是主語從句（不是表語從句）必須要用過去完成時。理由同上。　　

句子三：Ashamed of having acted so rashly, Dimitri apologized to Aleko for having accused him.　　

句中用作介詞 of 和 for 后面的動詞都一定要用動名詞的完成式。理由同上。　　

句子一：　　

Dimitri immediately went to Aleko's house and angrily accused him of stealing the lamb　　

這句的中stealing 完全可以換成 having steal。又如：　　

He was accused of deserting his ship. / He was accused of having deserted his ship. 他被控棄船逃跑�！�—摘自《牛津實用英語語法》第四版　　

句子二：　　

Aleko denied taking it.　　

這句完全可以用denied having take it. 關于這個問題，查《英語常用詞多用途詞典》（金盾出版社）在deny詞條有如下用法說明：　　

……表示否認做過某事，deny后要接動名詞(或用一般式或完成式)，但不能接不定式：He denied telling [having told] me. 他否認告訴過我。這類句子也可換成用從句的形式來表達：He denied that he had told me.　　

……　　

總結：　　

有些動名詞用于accuse, forget, regret, remember, admit, deny等動詞后作賓語時，若表示的動作發生在主要動作之前，可以用一般式，也可用完成式。——參考《高中英語語法大全》（湖南大學出版社）