You can stop.
( You ( ( can stop ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB stop))) (. .)))
You don't have to go on.
( You ( ( ( do n't ) ( have ( to ( go on ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (VBP do) (RB n't) (VP (VB have) (S (VP (TO to) (VP (VB go) (PRT (RP on))))))) (. .)))