Being+动词过去分词强调正在被.时用.
Beinginterviewed,hefeltverynervouse.
done放在句首时表示:被动,完成或状态.
Seenfromthetop,thebuildingisveryhigh.
wornoutafteralongwalk,hefeltverytired.
Havingdone放在句首表示该动作与主句的主语是主动关系且强调该动作发生在主句谓语动作之前.
Havingfinishedhiswork,hewenthomehappily.
Havingbeendone是时态没有变,多了被动语态是么
Havingbeendone表示该动作与主句的主语是被动关系且强调该动作发生在主句谓语动作之前