Present simple i usually watch tv in the evenings. present progressive i am watching tv now. present perfect i have known john since 1999. i have known john for 5 years.

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..