I liked that part.
( I ( ( liked ( that part ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD liked) (NP (DT that) (NN part))) (. .)))
I did not enjoy that part at all.
( I ( ( ( did not ) ( ( enjoy ( that part ) ) ( at all ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD did) (RB not) (VP (VB enjoy) (NP (DT that) (NN part)) (ADVP (IN at) (DT all)))) (. .)))