the present perfec

the present perfect looks back from the present into the past, and expresses what has happened before now. the action happened at an indefinite time in the past.

example: I VE MET A LOT OF FAMOUS PEOPLE.
               SHE HAS WON AWARDS.
              SHE HAS WRITTEN 20 SONGS.
THE ACTION CAN CONTINUE TO THE PRESENT, AND PROBABLY INTO THE FUTURE.

SHE HAS LIVED HERE FOR 20 YEARS.