has lost some of the dramatic conviction that underlies the best of comedies ... 
(ROOT (S (VP (VBZ has) (VP (VBN lost) (NP (NP (DT some)) (PP (IN of) (NP (NP (DT the) (JJ dramatic) (NN conviction)) (SBAR (WHNP (WDT that)) (S (VP (VBZ underlies) (NP (NP (DT the) (JJS best)) (PP (IN of) (NP (NNS comedies)))))))))))) (. ...)))
(ROOT (S (VP (VBZ ) (VP (VBN ) (NP (NP (DT )) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (NP (DT ) (JJS )) (PP (IN ) (NP (NNS )))))))))))) (. )))