I forgot about comic books!
( I ( ( forgot ( about ( comic books ) ) ) ! ) )
(ROOT (S (NP (PRP I)) (VP (VBD forgot) (PP (IN about) (NP (JJ comic) (NNS books)))) (. !)))
I did not mention comic books yet.
( I ( ( ( did not ) ( ( mention ( comic books ) ) yet ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD did) (RB not) (VP (VB mention) (NP (JJ comic) (NNS books)) (ADVP (RB yet)))) (. .)))