It was then of his sure , boulders .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 It)) (VP_4 (ATVP_3 (ATVP_2 (ATVP_0 (VBD_1 was) (ADVP_0 (RB_0 then))) (PP_1 (IN_1 of) (NP_2 (PRPDOLLAR_0 his) (JJ_0 sure)))) (COMMA_0 ,)) (NP_3 (NNS_1 boulders)))) (DOT_0 .)))