Képzése:
A “have” segédige jelen idejű alakja (have, E/3 has) + az ige harmadik alakja (past participle).
Pl.: I have been to the USA. He has been to the USA.
Tagadás a “not” szócskával történik.
Pl.: I have not (haven’t) been to the USA.
Kérdésben fordított szórendet használunk.
Pl.: Have you been to the USA? Haven’t you been to the USA?



http://i-school.hu/present-perfect-befejezett-jelen/
Has Jim ever met an athlete?
Yes he has. But Lucy haven't met an athlete. She has met a famous actor.
Have Dan and Joh seen a dolphin?
Yes, they have, but Jim and Lucy haven't seen a dolphin. They have seen a sea turtle.