having done放句首是不是状语从句的省略啊？

Question

rt，谢谢！

Answer 1

having done位于句首是非谓语动词作状语，也可以当作是状语从句的省略形式

Answer 2

having done 放于句首，若着状语，相当于状语从句的省略。
Having finished his homework, he went to bed. (时间状语）
= After he had finished his homework, he went to be.（时间状语从句）本回答被提问者采纳

Answer 3

Having
done
是完成时，若放在句首有主动的含义，而
done
放句首一般表示被动含义。
比如：Having
used
it,I
put
it
on
the
desk.意思表示：用完它以后，我就把它放在捉上了。其中我用这个东西，是主动，所以应该用－ing形式。
如果：used
too
much,it
fade
its
colour.此时，used
就是修饰it，因为it是被用的，表示被动．
一般情况下，Having
done
表示主动含义，而done
表示被动含义。