there are many definitions of ` time waster ' 
(ROOT (S (NP (EX there)) (VP (VBP are) (NP (NP (JJ many) (NNS definitions)) (PP (IN of) (`` `) (NP (NN time) (NN waster)) ('' '))))))
(ROOT (S (NP (EX )) (VP (VBP ) (NP (NP (JJ ) (NNS )) (PP (IN ) (`` ) (NP (NN ) (NN )) ('' ))))))