(S (S (S (NP (EX There)) (VP (VP (VBZ is) (BASENP (DT a) (JJ slight) (NN slope))) (PP (IN under) (BASENP (DT the) (NN bus))))) (CC and) (S (BASENP (PRPD its) (JJ rear) (NN end)) (VP (VBZ appears) (S (VP (TO to) (VP (VB have) (VP (VP (VBN reached) (NP (BASENP (DT the) (NN bottom)) (PP (IN of) (BASENP (DT the) (NN drop))))) (COMMA ,) (S (VP (VP (VBG crushing) (BASENP (DT the) (NN roof))) (PP (IN at) (NP (BASENP (DT the) (NN back)) (PP (IN of) (BASENP (DT the) (NN bus)))))))))))))) (PERIOD .))