to leave , , , Plus they watched looking .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (ATS_0 (ATS_0 (ATS_0 (S_1 (VP_0 (TO_0 to) (VP_1 (VB_0 leave)))) (COMMA_0 ,)) (COMMA_0 ,)) (COMMA_0 ,)) (CC_0 Plus)) (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_2 watched) (S_2 (VP_0 (VBG_0 looking)))))) (DOT_0 .)))