be surprised at the variety of tones in spielberg 's work 
(ROOT (S (VP (VB be) (VP (VBN surprised) (PP (IN at) (NP (NP (DT the) (NN variety)) (PP (IN of) (NP (NNS tones))) (PP (IN in) (NP (NP (NNP spielberg) (POS 's)) (NN work)))))))))
(ROOT (S (VP (VB ) (VP (VBN ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NNS ))) (PP (IN ) (NP (NP (NNP ) (POS )) (NN )))))))))