diff --git a/ps-grammar/confirm/confirm.jsgf b/ps-grammar/confirm/confirm.jsgf
index 0874b691fb24b62dcfafec447daa23930a61c7ff..0993d81c207c7de231e569ec1a1ed68a27f7ce3c 100644
--- a/ps-grammar/confirm/confirm.jsgf
+++ b/ps-grammar/confirm/confirm.jsgf
@@ -1,5 +1,5 @@
 #JSGF V1.0;
 grammar ToBI_confirm;
 public <confirm> = [tobi] (<confirm_yes> | <confirm_no>) [tobi];
-<confirm_yes> =  ([please] yes [please]) | ([that is] correct);
-<confirm_no> = ([that is] not correct) | (no [thanks]); 
+<confirm_yes> = (tobi yes);
+<confirm_no> = (tobi no);