while it had later teaching up I grimaced moan cows , he do even stifled down .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (SBAR_0 (IN_2 while) (S_1 (NP_0 (PRP_1 it)) (VP_5 (ATVP_1 (VBD_1 had) (RB_1 later)) (VP_1 (ATVP_0 (VBG_0 teaching) (PRT_0 (RP_0 up))) (SBAR_0 (S_1 (NP_0 (PRP_1 I)) (VP_5 (VBD_1 grimaced) (NP_3 (NN_0 moan) (NNS_1 cows))))))))) (COMMA_0 ,)) (NP_0 (PRP_1 he))) (VP_3 (ATVP_1 (VBP_0 do) (RB_1 even)) (VP_5 (VBD_0 stifled) (PRT_0 (RP_0 down))))) (DOT_0 .)))