They left about I scared of the lesson .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (ATVP_3 (VBD_2 left) (PRT_0 (RP_0 about))) (S_2 (NP_1 (PRP_0 I)) (VP_2 (VBN_0 scared) (PP_0 (IN_1 of) (NP_5 (DT_0 the) (NN_2 lesson))))))) (DOT_0 .)))