hard pressed to succumb to the call of the wild 
(ROOT (ADVP (RB hard) (VBN pressed) (S (VP (TO to) (VP (VB succumb) (PP (IN to) (NP (NP (DT the) (NN call)) (PP (IN of) (NP (DT the) (NN wild))))))))))
(ROOT (ADVP (RB ) (VBN ) (S (VP (TO ) (VP (VB ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN ))))))))))