They did sitting . it was .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_0 did) (SBAR_0 (S_2 (VBG_0 sitting))))) (DOT_0 .)) (NP_0 (PRP_1 it))) (VP_3 (VBD_0 was))) (DOT_0 .)))