I smiled vaguely.
( I ( ( smiled vaguely ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD smiled) (NP (NNS vaguely))) (. .)))
I frowned and cried hysterically.
( I ( ( ( frowned and ) ( cried hysterically ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VP (VBD frowned)) (CC and) (VP (VBD cried) (ADVP (RB hysterically)))) (. .)))