I attended doing in a back coat of the guy .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 I)) (VP_4 (VBD_1 attended) (VP_2 (VBG_0 doing) (PP_2 (IN_0 in) (NP_3 (NP_6 (ATNP_1 (DT_0 a) (JJ_1 back)) (NN_1 coat)) (PP_0 (IN_1 of) (NP_5 (DT_0 the) (NN_2 guy)))))))) (DOT_0 .)))