'll keep watching the skies for his next project 
(ROOT (S (VP (MD 'll) (VP (VB keep) (S (VP (VBG watching) (NP (DT the) (NNS skies)) (PP (IN for) (NP (PRP$ his) (JJ next) (NN project)))))))))
(ROOT (S (VP (MD ) (VP (VB ) (S (VP (VBG ) (NP (DT ) (NNS )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN )))))))))