If fake left let back let off how the air so been .
(ROOT_0 (S_0 (ATS_3 (NP_1 (IN_2 If) (NN_3 fake)) (VP_4 (VBD_2 left) (S_2 (VP_0 (ATVP_1 (VBD_0 let) (RB_1 back)) (VP_1 (ATVP_0 (VB_0 let) (PRT_0 (RP_0 off))) (SBAR_0 (WHADVP_0 (WRB_0 how)) (S_1 (NP_0 (DT_0 the) (NN_2 air)) (VP_5 (ADVP_0 (RB_0 so)) (VBN_0 been))))))))) (DOT_0 .)))