You never call.
( You ( never ( call . ) ) )
(ROOT (S (NP (PRP You)) (ADVP (RB never)) (VP (VBP call)) (. .)))
You rarely call. 
( You ( rarely ( call . ) ) )
(ROOT (S (NP (PRP You)) (ADVP (RB rarely)) (VP (VBP call)) (. .)))