Was ist eigentlich das present perfect und wann verwendest du es?

Lies dir zuerst den Dialog durch und achte darauf, wann das present perfect verwendet wird:

Patrick: Psst! Don’t go into the bathroom, I have just cleaned it.
Rachel: What?! I don’t believe you! I have never seen you cleaning anything.
Patrick: Mum said I am not allowed to play with my computer or phone until I have tidied my room and I have cleaned the bathroom and that’s what I have done.