punching people in the stomach again 
(ROOT (S (VP (VBG punching) (NP (NNS people)) (PP (IN in) (NP (DT the) (NN stomach))) (ADVP (RB again)))))
(ROOT (S (VP (VBG ) (NP (NNS )) (PP (IN ) (NP (DT ) (NN ))) (ADVP (RB )))))