he piled be , they <apostrophe>s in .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_0 (S_1 (NP_0 (PRP_1 he)) (VP_5 (VBD_2 piled) (S_2 (VB_0 be)))) (COMMA_0 ,)) (NP_0 (PRP_1 they))) (VP_3 (VBZ_0 <apostrophe>s) (PP_1 (IN_1 in)))) (DOT_0 .)))