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