he was back of the big cows When .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 he)) (VP_4 (VBD_1 was) (ADJP_0 (JJ_1 back) (PP_1 (IN_1 of) (NP_2 (NP_5 (ATNP_1 (DT_0 the) (JJ_1 big)) (NNS_1 cows)) (FRAG_0 (WRB_0 When))))))) (DOT_0 .)))