I'm busy now.
( I ( ( ( 'm busy ) now ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP 'm) (ADJP (JJ busy)) (ADVP (RB now))) (. .)))
I'm not free right now.
( I ( ( ( ( 'm not ) free ) ( right now ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP 'm) (RB not) (ADJP (JJ free)) (ADVP (RB right) (RB now))) (. .)))