I still read history.
( I ( still ( ( read history ) . ) ) )
(ROOT (S (NP (PRP I)) (ADVP (RB still)) (VP (VBP read) (NP (NN history))) (. .)))
I don't read history.
( I ( ( ( do n't ) ( read history ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB read) (NP (NN history)))) (. .)))