Call me once you reach home.
Call me once you have reached home.
what is the difference?
I'll only be satisfied after I pass my test with good marks.
I'll only be satisfied after I have passed my test with good marks.
which one is more correct?
Does the use of simple present mean the activity is performed at the very instant of reaching home or say passing the exam, and the use of present perfect means sometimes after the say reaching home or passing the exam ?