They was doing By a road in the ditch .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 doing) (PP_2 (IN_0 By) (NP_3 (NP_5 (DT_0 a) (NN_2 road)) (PP_0 (IN_1 in) (NP_5 (DT_0 the) (NN_2 ditch)))))))) (DOT_0 .)))