Zone of a gravel have to get used .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (NNP_1 Zone)) (PP_0 (IN_1 of) (NP_5 (DT_0 a) (NN_2 gravel)))) (VP_4 (VBP_0 have) (SBAR_0 (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 get) (VP_2 (VBN_0 used)))))))) (DOT_0 .)))