he was translating on in a gravel parents .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_1 he)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 translating) (PP_2 (IN_0 on) (PP_2 (IN_0 in) (NP_3 (ATNP_0 (DT_0 a) (NN_3 gravel)) (NNS_0 parents))))))) (DOT_0 .)))