What is the rule to conjuguate a verb in the present perfect progressive?

أفضل جواب: No one saw my old question, so I up it to gain it to attract more attention to that one  الإطلاع على المزيد

أفضل جواب: You use the simple past to talk about an event that happened at a certain time. Ex.: I went to UK two ye ... الإطلاع على المزيد

أفضل جواب: Present Perfect Simple   Unfinished actions that started in the past and continue to the present: I've kn ... الإطلاع على المزيد

أفضل جواب: which work we done it is called perfect. which work we done in these days الإطلاع على المزيد