to have forgotten everything he ever knew about generating suspense 
(ROOT (S (VP (TO to) (VP (VB have) (VP (VBN forgotten) (NP (NP (NN everything)) (SBAR (S (NP (PRP he)) (ADVP (RB ever)) (VP (VBD knew) (PP (IN about) (S (VP (VBG generating) (NP (NN suspense))))))))))))))
(ROOT (S (VP (TO ) (VP (VB ) (VP (VBN ) (NP (NP (NN )) (SBAR (S (NP (PRP )) (ADVP (RB )) (VP (VBD ) (PP (IN ) (S (VP (VBG ) (NP (NN ))))))))))))))