what 's missing from this material is any depth of feeling 
(ROOT (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 (SBAR (WHNP (WP )) (S (VP (VBZ ) (VP (VBG ) (PP (IN ) (NP (DT ) (NN ))))))) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))))))