know how to please the eye 
(ROOT (S (VP (VB know) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB please) (NP (DT the) (NN eye)))))))))
(ROOT (S (VP (VB ) (SBAR (WHADVP (WRB )) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN )))))))))