I let to keep did back onto eyes .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 I)) (VP_4 (VBD_0 let) (SBAR_0 (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 keep) (S_2 (VP_0 (ATVP_4 (VBD_0 did) (RB_1 back)) (PP_2 (IN_0 onto) (NP_3 (NNS_1 eyes))))))))))) (DOT_0 .)))