a gravel did never , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (S_1 (NP_0 (DT_0 a) (NN_2 gravel)) (VP_5 (VBD_1 did) (ADVP_0 (RB_0 never))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))