He had classes Behind one air sitting .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 He)) (VP_4 (VBD_1 had) (NP_2 (ATNP_2 (NP_4 (NNS_1 classes)) (PP_2 (IN_0 Behind) (NP_3 (NP_4 (CD_0 one)) (NN_2 air)))) (SBAR_0 (S_2 (VBG_0 sitting)))))) (DOT_0 .)))