is hard to conceive anyone else in their roles . 
(ROOT (S (VP (VBZ is) (ADJP (JJ hard)) (S (VP (TO to) (VP (VB conceive) (NP (NP (NN anyone)) (ADJP (JJ else))) (PP (IN in) (NP (PRP$ their) (NNS roles))))))) (. .)))
(ROOT (S (VP (VBZ ) (ADJP (JJ )) (S (VP (TO ) (VP (VB ) (NP (NP (NN )) (ADJP (JJ ))) (PP (IN ) (NP (PRP$ ) (NNS ))))))) (. )))