spent watching this waste of time 
(ROOT (S (VP (VBD spent) (S (VP (VBG watching) (NP (NP (DT this) (NN waste)) (PP (IN of) (NP (NN time)))))))))
(ROOT (S (VP (VBD ) (S (VP (VBG ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))))))))