the three leads produce adequate performances , but what 's missing from this material is any depth of feeling . 
(ROOT (S (S (NP (DT the) (CD three) (NNS leads)) (VP (VBP produce) (NP (JJ adequate) (NNS performances)))) (, ,) (CC but) (S (SBAR (WHNP (WP what)) (S (VP (VBZ 's) (VP (VBG missing) (PP (IN from) (NP (DT this) (NN material))))))) (VP (VBZ is) (NP (NP (DT any) (NN depth)) (PP (IN of) (NP (NN feeling)))))) (. .)))
(ROOT (S (S (NP (DT ) (CD ) (NNS )) (VP (VBP ) (NP (JJ ) (NNS )))) (, ) (CC ) (S (SBAR (WHNP (WP )) (S (VP (VBZ ) (VP (VBG ) (PP (IN ) (NP (DT ) (NN ))))))) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))))) (. )))