have done 只是很簡單的“現(xiàn)在完成時”的體現(xiàn).
having done sth 一般出現(xiàn)在句首,表達出“在...的前提下”那層意思,后面必定跟著一條完整從句.
例如：
I have done(finished) my homework.我已經(jīng)完成我的作業(yè)了.
Having done(finished) all the homework, I'm going to watch a little TV now.
功課都已完成,我要來看會兒電視.
Stanley has promised his mother to study hard.
Having promised his mom, Stanley is now studying hard.
如果仍不能理解就再追問吧.having done 只用在引導(dǎo)狀語從句么？ 還有其他用途么？就我所知，沒有。你要是見到什么特別例句，不妨提出來我給分析一下