they thought on going teeth , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_2 thought) (PP_2 (IN_0 on) (NP_6 (VBG_0 going) (NNS_0 teeth)))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))