like a dinner guest showing off his doctorate 
(ROOT (PP (IN like) (NP (NP (DT a) (NN dinner) (NN guest)) (VP (VBG showing) (PRT (RP off)) (NP (PRP$ his) (NN doctorate))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN ) (NN )) (VP (VBG ) (PRT (RP )) (NP (PRP$ ) (NN ))))))