back someone breathe good classes if they attended .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (RB_1 back) (NP_5 (NN_3 someone))) (VP_3 (ATVP_2 (VB_0 breathe) (NP_4 (JJ_1 good) (NNS_1 classes))) (SBAR_0 (IN_2 if) (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_1 attended)))))) (DOT_0 .)))