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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_3 (NP_1 (ATNP_0 (NP_6 (DT_0 a) (NNS_1 classes)) (COMMA_0 ,)) (NNS_0 calculations)) (VP_4 (VBD_0 did) (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (VP_0 (ATVP_1 (MD_0 could) (RB_1 n<apostrophe>t)) (VP_1 (VB_0 be))))))) (DOT_0 .)) (NP_0 (NNP_0 Twilight))) (VP_3 (VBD_1 grimaced) (VP_2 (VBG_0 climbing) (PP_2 (ATPP_0 (ADVP_0 (RB_0 just)) (IN_2 as)) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 be) (VP_2 (VBG_0 looking) (NP_5 (DT_0 the) (NN_2 car)))))))))) (DOT_0 .)))