her <apostrophe>s she mumbled on to keep on .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 her)) (VP_4 (VBZ_0 <apostrophe>s) (S_1 (NP_0 (PRP_1 she)) (VP_5 (ATVP_3 (VBD_2 mumbled) (PRT_0 (RP_0 on))) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 keep) (PRT_0 (RP_0 on))))))))) (DOT_0 .)))