must be a serious contender for the title . 
(ROOT (S (VP (MD must) (VP (VB be) (NP (NP (DT a) (JJ serious) (NN contender)) (PP (IN for) (NP (DT the) (NN title)))))) (. .)))
(ROOT (S (VP (MD ) (VP (VB ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN )))))) (. )))