... watching it was painful . 
(ROOT (S (, ...) (S (VP (VBG watching) (NP (PRP it)))) (VP (VBD was) (ADJP (JJ painful))) (. .)))
(ROOT (S (, ) (S (VP (VBG ) (NP (PRP )))) (VP (VBD ) (ADJP (JJ ))) (. )))