to have done用法与having done

to have done用法与having done
to have done 是现在完成时的形式，表示过去的动作或状态对现在造成的影响或结果，常与时间状语（如just, already, yet, ever, never等）连用，如：
- She has finished her homework. （她已经完成了她的作业。

）
- They have been married for 10 years. （他们已经结婚10年了。

）
- Have you ever been to Paris? （你曾经去过巴黎吗？）
- I haven't seen him yet today. （我今天还没有见到他。

）
having done 是现在分词的形式，表示在某个行动之后发生的动作或状态，通常在句子中作状语，如：
- Having finished her homework, she went to bed. （完成作业后，她去睡觉了。

）
- He left the office, having worked overtime all week. （他一周加班后离开了办公室。

）
- She stood there, having no idea what to do next. （她站在那里，不知道接下来该怎么做。

）。