in a sudden yawn , the boy howled .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (IN_0 in) (NP_6 (ATNP_1 (DT_0 a) (JJ_1 sudden)) (NN_1 yawn))) (COMMA_0 ,)) (NP_0 (DT_0 the) (NN_2 boy))) (VP_3 (VBD_0 howled))) (DOT_0 .)))