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