of the worst films of the summer 
(ROOT (PP (IN of) (NP (NP (DT the) (JJS worst) (NNS films)) (PP (IN of) (NP (DT the) (NN summer))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJS ) (NNS )) (PP (IN ) (NP (DT ) (NN ))))))