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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (NP_1 (PRP_0 her)) (VP_0 (TO_0 to) (VP_1 (ATVP_3 (VBD_2 watched) (PRT_0 (RP_0 out))) (PP_0 (IN_1 of) (NP_5 (DT_0 the) (NN_2 conference))))))) (COMMA_0 ,)) (NP_0 (DT_1 All))) (VP_3 (ATVP_1 (MD_0 could) (ADVP_0 (RB_1 back) (PP_0 (IN_1 on) (NP_6 (DT_0 a) (NNS_1 classes))))) (ADJP_0 (RP_0 on)))) (DOT_0 .)))