It mutter into to stop up when I used In back school .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 It)) (VP_4 (VBP_0 mutter) (SBAR_0 (IN_2 into) (S_1 (VP_0 (TO_0 to) (VP_1 (ATVP_0 (VB_0 stop) (PRT_0 (RP_0 up))) (SBAR_0 (WHADVP_0 (WRB_0 when)) (S_1 (NP_0 (PRP_1 I)) (VP_5 (VBD_2 used) (PP_2 (IN_0 In) (NP_3 (JJ_1 back) (NN_0 school)))))))))))) (DOT_0 .)))