they smiled , and you back n<apostrophe>t jerked .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (ATS_0 (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_1 smiled))) (COMMA_0 ,)) (CC_0 and)) (S_1 (NP_0 (PRP_1 you)) (VP_5 (ADVP_0 (RB_1 back) (RB_1 n<apostrophe>t)) (VBN_0 jerked)))) (DOT_0 .)))