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diff --git a/examples-3.0/tutorial/semantics/SemBase.hs b/examples-3.0/tutorial/semantics/SemBase.hs
new file mode 100644
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+++ b/examples-3.0/tutorial/semantics/SemBase.hs
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+module SemBase where
+
+import GSyntax
+import Logic
+
+-- translation of Base syntax to Logic
+
+iS :: GS -> Prop
+iS s = case s of
+  GPredAP np ap -> iNP np (iAP ap)
+  GConjS c s t  -> iConj c (iS s) (iS t)
+
+iNP :: GNP -> (Exp -> Prop) -> Prop
+iNP np p = case np of
+  GEvery cn -> All   (If  (iCN cn var) (liftProp 0 (p var))) ----
+  GSome  cn -> Exist (And (iCN cn var) (p var)) ----
+  GConjNP c np1 np2 -> iConj c (iNP np1 p) (iNP np2 p)
+  GUseInt (GInt i) -> p (int i)
+
+iAP :: GAP -> Exp -> Prop
+iAP ap e = case ap of
+  GComplA2 a2 np    -> iNP np (iA2 a2 e)
+  GConjAP c ap1 ap2 -> iConj c (iAP ap1 e) (iAP ap2 e)
+  GEven -> ev e
+  GOdd -> Not (ev e)
+
+iCN :: GCN -> Exp -> Prop
+iCN cn e = case cn of
+  GModCN ap cn0 -> And (iCN cn0 e) (iAP ap e)
+  GNumber -> eq e e
+
+iConj :: GConj -> Prop -> Prop -> Prop
+iConj c = case c of
+  GAnd -> And
+  GOr  -> Or
+
+iA2 :: GA2 -> Exp -> Exp -> Prop
+iA2 a2 e1 e2 = case a2 of
+  GGreater -> lt e2 e1
+  GSmaller -> lt e1 e2 
+  GEqual   -> eq e1 e2
+
+var = Var 0