So I liked that.
( So ( I ( ( liked that ) . ) ) )
(ROOT (S (IN So) (NP (PRP I)) (VP (VBD liked) (NP (DT that))) (. .)))
I liked that, so what?
( ( ( ( I ( liked that ) ) , ) so ) ( what ? ) )
(ROOT (S (S (NP (PRP I)) (VP (VBD liked) (NP (DT that)))) (, ,) (RB so) (SBARQ (WHNP (WP what)) (. ?))))