to let a story used the alpaca bag on a boy .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 let)))) (NP_0 (DT_0 a) (NN_2 story))) (VP_3 (VBD_0 used) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (NN_3 alpaca)) (NN_1 bag)) (PP_0 (IN_1 on) (NP_5 (DT_0 a) (NN_2 boy)))))) (DOT_0 .)))