chan has done in the united states 
(ROOT (S (NP (NNP chan)) (VP (VBZ has) (VP (VBN done) (PP (IN in) (NP (DT the) (NNP united) (NNPS states)))))))
(ROOT (S (NP (NNP )) (VP (VBZ ) (VP (VBN ) (PP (IN ) (NP (DT ) (NNP ) (NNPS )))))))