So it was traumatic.
( So ( it ( ( was traumatic ) . ) ) )
(ROOT (S (IN So) (NP (PRP it)) (VP (VBD was) (ADJP (JJ traumatic))) (. .)))
It wasn't traumatic for me. 
( It ( ( ( was n't ) ( traumatic ( for me ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (RB n't) (VP (VBN traumatic) (PP (IN for) (NP (PRP me))))) (. .)))