He think off on as they happened on .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 He)) (VP_4 (ATVP_2 (VB_0 think) (PRT_0 (RP_0 off))) (PP_2 (IN_0 on) (SBAR_0 (IN_2 as) (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_0 happened) (PRT_0 (RP_0 on)))))))) (DOT_0 .)))