I shan't stop you."
( I ( ( ( ( sha n't ) ( stop you ) ) . ) '' ) )
(ROOT (S (NP (PRP I)) (VP (VBP sha) (RB n't) (VP (VB stop) (NP (PRP you)))) (. .) ('' '')))
I will stop you.
( I ( ( will ( stop you ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD will) (VP (VB stop) (NP (PRP you)))) (. .)))