`` I `` doing still , they discovered .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_0 (ATS_0 (TICK_0 ``) (S_1 (NP_1 (PRP_0 I)) (VP_5 (ATVP_4 (TICK_0 ``) (VBG_0 doing)) (ADVP_0 (RB_0 still))))) (COMMA_0 ,)) (NP_0 (PRP_1 they))) (VP_3 (VBD_0 discovered))) (DOT_0 .)))