really then , I <apostrophe>s when he was his calculations .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_0 (ATS_0 (ADVP_0 (RB_0 really)) (ADVP_0 (RB_0 then))) (COMMA_0 ,)) (NP_0 (PRP_0 I))) (VP_3 (VBZ_0 <apostrophe>s) (SBAR_0 (WHADVP_0 (WRB_0 when)) (S_1 (NP_0 (PRP_1 he)) (VP_5 (VBD_1 was) (NP_3 (PRPDOLLAR_0 his) (NNS_0 calculations))))))) (DOT_0 .)))