You can literally help save a life.
( You ( ( ( can literally ) ( help ( save ( a life ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD can) (ADVP (RB literally)) (VP (VB help) (VP (VB save) (NP (DT a) (NN life))))) (. .)))
You won't' be saving a life.
( ( You ( wo n't ) ) ( ' ( ( be ( saving ( a life ) ) ) . ) ) )
(ROOT (S (S (NP (PRP You)) (VP (MD wo) (RB n't))) ('' ') (VP (VBP be) (VP (VBG saving) (NP (DT a) (NN life)))) (. .)))