off class have When the boy used in back glasses .
(ROOT_0 (S_0 (ATS_3 (NP_1 (IN_2 off) (NN_3 class)) (VP_4 (VBP_0 have) (SBAR_0 (WHADVP_0 (WRB_0 When)) (S_1 (NP_0 (DT_0 the) (NN_2 boy)) (VP_5 (VBD_2 used) (PP_2 (IN_0 in) (NP_3 (JJ_1 back) (NNS_0 glasses)))))))) (DOT_0 .)))