every conceivable mistake a director could make in filming opera has been perpetrated here . 
(ROOT (S (NP (NP (DT every) (JJ conceivable) (NN mistake)) (SBAR (S (NP (DT a) (NN director)) (VP (MD could) (VP (VB make) (PP (IN in) (S (VP (VBG filming) (NP (NN opera)))))))))) (VP (VBZ has) (VP (VBN been) (VP (VBN perpetrated) (ADVP (RB here))))) (. .)))
(ROOT (S (NP (NP (DT ) (JJ ) (NN )) (SBAR (S (NP (DT ) (NN )) (VP (MD ) (VP (VB ) (PP (IN ) (S (VP (VBG ) (NP (NN )))))))))) (VP (VBZ ) (VP (VBN ) (VP (VBN ) (ADVP (RB ))))) (. )))