Present Simple:
I usually watch TV in the evenings. ...V... ,
He usually watches TV in the evenings. ....Vs...
Present Progressive:
I am watching TV now. ...am.
They are watching TV now. ...are Ving...
He is watching TV now. ...is Ving...
Present Perfect :
He has known John since 1999. ... has V3..
I have known John for 5 years. ... have V3...
She has known John since 1999. ... has V3...
I have known John for 5 years. ... have V3..