we is it left back in hat .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_1 we)) (VP_4 (VBZ_0 is) (S_1 (NP_0 (PRP_1 it)) (VP_5 (ATVP_3 (VBD_2 left) (PRT_0 (RP_0 back))) (PP_0 (IN_1 in) (NP_2 (NN_3 hat))))))) (DOT_0 .)))