under the grass to keep , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 under) (NP_3 (NP_5 (DT_0 the) (NN_2 grass)) (SBAR_0 (VP_0 (TO_0 to) (VP_1 (VB_0 keep)))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))