is about the worst thing chan has done in the united states . 
(ROOT (S (VP (VBZ is) (NP (NP (IN about) (DT the) (JJS worst) (NN thing)) (SBAR (S (NP (NN chan)) (VP (VBZ has) (VP (VBN done) (PP (IN in) (NP (DT the) (NNP united) (NNS states))))))))) (. .)))
(ROOT (S (VP (VBZ ) (NP (NP (IN ) (DT ) (JJS ) (NN )) (SBAR (S (NP (NN )) (VP (VBZ ) (VP (VBN ) (PP (IN ) (NP (DT ) (NNP ) (NNS ))))))))) (. )))