has worked wonders with the material . 
(ROOT (S (VP (VBZ has) (VP (VBN worked) (NP (NNS wonders)) (PP (IN with) (NP (DT the) (NN material))))) (. .)))
(ROOT (S (VP (VBZ ) (VP (VBN ) (NP (NNS )) (PP (IN ) (NP (DT ) (NN ))))) (. )))