在高中英语非谓语动词单选中,在句首经常是有 ①Being+动词过去分词 ②动词过去式的选项.两个都可以表示被动,那么怎么区分.在什么情况下用Having done,以及done.

Being+动词过去分词 强调正在被.时用.
Being interviewed ,he felt very nervouse .
done放在句首时表示：被动,完成或状态 .
Seen from the top ,the building is very high .
worn out after a long walk ,he felt very tired .
Having done 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.
Having finished his work ,he went home happily .Having been done 是时态没有变，多了被动语态是么Having been done 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