gaping plot holes sink this ` sub ' - 
(ROOT (S (NP (VBG gaping) (NN plot) (NNS holes)) (VP (VBP sink) (NP (DT this) (`` `) (NN sub) ('' '))) (: -)))
(ROOT (S (NP (VBG ) (NN ) (NNS )) (VP (VBP ) (NP (DT ) (`` ) (NN ) ('' ))) (: )))