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