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