He was about be back stifled quite on In the skeletal seat .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 He)) (VP_4 (ATVP_3 (VBD_2 was) (PRT_0 (RP_0 about))) (S_2 (VP_0 (ATVP_0 (VB_0 be) (PRT_0 (RP_0 back))) (VP_2 (ATVP_4 (VBD_0 stifled) (RB_1 quite)) (PP_2 (IN_0 on) (PP_2 (IN_0 In) (NP_6 (ATNP_1 (DT_0 the) (JJ_1 skeletal)) (NN_1 seat))))))))) (DOT_0 .)))