a gravel perch friend saw later be down .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (ATNP_1 (DT_0 a) (JJ_1 gravel)) (NN_0 perch)) (NN_0 friend)) (VP_4 (ATVP_1 (VBD_1 saw) (RB_1 later)) (VP_1 (VB_0 be) (PRT_0 (RP_0 down))))) (DOT_0 .)))