Use: actions and
experiences in the past that are relevant now. Unfinished time.
has/have VERB (past
participle form: driven, given, made, etc.)
in this house for twenty years.
(Twenty years ago, we started
living in this house. We still live in this house now.)
has climbed Mount Everest
(He climbed Mount Everest in 1988, 1999, and 2012. He might climb
Negative Form: has/have not
Sara has not completed
the project yet. (Sara started
the project on Monday. Today is Friday, and the project
is still not done.)
not completed the process yet.