a doing valley by the boy was stepping baby .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (ATNP_1 (DT_0 a) (VBG_0 doing)) (NN_1 valley)) (PP_0 (IN_0 by) (NP_5 (DT_0 the) (NN_2 boy)))) (VP_4 (VBD_1 was) (VP_2 (VBG_0 stepping) (NP_5 (NN_3 baby))))) (DOT_0 .)))