a ditch refer that They refer over chin things .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_0 a) (NN_2 ditch)) (VP_4 (VBP_0 refer) (SBAR_0 (WHNP_0 (WDT_0 that)) (S_1 (NP_1 (PRP_0 They)) (VP_5 (VBP_0 refer) (PP_2 (IN_0 over) (NP_3 (NN_0 chin) (NNS_1 things)))))))) (DOT_0 .)))