He had on think at not how it had being .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 He)) (VP_4 (ATVP_3 (VBD_2 had) (PRT_0 (RP_0 on))) (S_2 (VP_0 (ATVP_4 (VB_0 think) (PP_1 (IN_1 at) (NP_2 (RB_1 not)))) (SBAR_0 (WHADVP_0 (WRB_0 how)) (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBD_1 had) (SBAR_0 (S_1 (VBG_0 being)))))))))) (DOT_0 .)))