diff --git a/Convention/[Symbolization]/Detail/Keyword.cs b/Convention/[Symbolization]/Detail/Keyword.cs
index 9e086d4..4b9e6ae 100644
--- a/Convention/[Symbolization]/Detail/Keyword.cs
+++ b/Convention/[Symbolization]/Detail/Keyword.cs
@@ -6,104 +6,87 @@ namespace Convention.Symbolization.Internal
 {
     public abstract class Keyword : CloneableVariable<Keyword>
     {
-        protected Keyword(string keyword) : base(keyword)
-        {
-            Keywords.TryAdd(keyword, this);
-        }
+        protected Keyword(string keyword) : base(keyword) { }
 
-        public static readonly Dictionary<string, Keyword> Keywords = new();
+        public static readonly Dictionary<string, Keyword> Keywords = new()
+        {
+            {  "import", new Convention.Symbolization.Keyword.Import() },
+            { "namespace", new Convention.Symbolization.Keyword.Namespace() },
+            { "def", new Convention.Symbolization.Keyword.FunctionDef() },
+            { "return", new Convention.Symbolization.Keyword.Return() },
+            { "if", new Convention.Symbolization.Keyword.If() },
+            { "elif", new Convention.Symbolization.Keyword.Elif() },
+            { "else", new Convention.Symbolization.Keyword.Else() },
+            { "while", new Convention.Symbolization.Keyword.While() },
+            { "break", new Convention.Symbolization.Keyword.Break() },
+            { "continue", new Convention.Symbolization.Keyword.Continue() },
+            { "struct", new Convention.Symbolization.Keyword.Structure() }
+        };
 
         public override bool Equals(Keyword other)
         {
             return this.GetType() == other.GetType();
         }
 
-        public virtual Keyword ControlContext(SymbolizationContext context, int line, int wordIndex, Variable next)
+        public virtual bool ControlScope(SymbolizationContext context, int line, int wordIndex, Variable next)
         {
-            return ControlContext(context, next);
+            return ControlScope(context, next);
         }
-        protected virtual Keyword ControlContext(SymbolizationContext context, Variable next)
+        protected virtual bool ControlScope(SymbolizationContext context, Variable next)
         {
-            return null;
+            return true;
         }
     }
 
     public abstract class Keyword<T> : Keyword where T : Keyword<T>, new()
     {
-        private static T MyInstance = new();
-
-        protected Keyword(string keyword) : base(keyword)
-        {
-        }
+        protected Keyword(string keyword) : base(keyword) { }
 
         public override bool Equals(Variable other)
         {
-            return MyInstance == other;
+            return other is T;
+        }
+
+        public override Keyword CloneVariable(string targetSymbolName)
+        {
+            return new T();
         }
     }
-
 }
 
 namespace Convention.Symbolization.Keyword
 {
-    /// <summary>
-    /// <b><see langword="import"/> file</b>
-    /// </summary>
-    public sealed class Import : Internal.Keyword<Import>
+    public abstract class SingleKeyword<T> : Internal.Keyword<T> where T : SingleKeyword<T>, new()
     {
-        public Import() : base("import")
+        protected SingleKeyword(string keyword) : base(keyword)
         {
         }
-
-        public override Internal.Keyword CloneVariable(string targetSymbolName)
+        protected override bool ControlScope(SymbolizationContext context, Internal.Variable next)
         {
-            return new Import();
-        }
-
-        private ToolFile ImportFile = new("./");
-        private string buffer = "";
-
-        protected override Internal.Keyword ControlContext(SymbolizationContext context, Internal.Variable next)
-        {
-            if (next is not Internal.ScriptWordVariable swv)
-            {
-                throw new InvalidGrammarException($"Not expected a key word: {next}");
-            }
-            if (swv.word == ";")
-            {
-                var importContext = new SymbolizationContext(context);
-                importContext.Compile(ImportFile);
-                return null;
-            }
-            else if (swv.word == ".")
-            {
-                ImportFile = ImportFile | buffer;
-                buffer = "";
-                if (ImportFile.Exists() == false)
-                    throw new FileNotFoundException($"File path not found: {ImportFile}", ImportFile);
-            }
-            else
-            {
-                buffer += swv.word;
-            }
-            return this;
+            if (next is not Internal.ScriptWordVariable swv ||swv.word!=";")
+                throw new InvalidGrammarException($"Expected ';' but got {next}");
+            return true;
         }
     }
 
-    /// <summary>
-    /// <b><see langword="namespace"/> name { ... }</b>
-    /// </summary>
-    public sealed class Namespace : Internal.Keyword<Namespace>
+    public abstract class SentenceKeyword<T> : Internal.Keyword<T> where T : SentenceKeyword<T>, new()
     {
-        public Namespace() : base("namespace")
+        protected SentenceKeyword(string keyword) : base(keyword)
         {
         }
-
-        public override Internal.Keyword CloneVariable(string targetSymbolName)
+        protected override bool ControlScope(SymbolizationContext context, Internal.Variable next)
         {
-            return new Namespace();
+            if (next is not Internal.ScriptWordVariable swv)
+                throw new InvalidGrammarException($"Not expected a key word: {next}");
+            return swv.word != ";";
         }
+    }
 
+    public abstract class NamespaceKeyword<T> : Internal.Keyword<T> where T : NamespaceKeyword<T>, new()
+    {
+        protected NamespaceKeyword(string keyword) : base(keyword)
+        {
+        }
         private enum Pause
         {
             Name, Body
@@ -111,50 +94,134 @@ namespace Convention.Symbolization.Keyword
 
         private Pause pause = Pause.Name;
         private int layer = 0;
-        private SymbolizationContext bulidingContext = null;
-        private Dictionary<int, Dictionary<int, Internal.Variable>> subScriptWords = new();
 
-        public override Internal.Keyword ControlContext(SymbolizationContext context,int line,int wordIndex, Internal.Variable next)
+        protected override bool ControlScope(SymbolizationContext context, Internal.Variable next)
         {
-            if (next is not Internal.ScriptWordVariable swv)
-            {
-                throw new InvalidGrammarException($"Not expected a key word: {next}");
-            }
             if (pause == Pause.Name)
             {
-                bulidingContext = new(context, context.CurrentNamespace.CreateOrGetSubNamespace(swv.word));
-                bulidingContext.CurrentNamespace.BeginUpdate();
-                pause = Pause.Body;
-            }
-            else
-            {
-                if (swv.word == "{")
-                    layer++;
-                else if (swv.word == "}")
-                    layer--;
-                if (layer == 0)
+                if (next is Internal.ScriptWordVariable swv)
                 {
-                    bulidingContext.Compile(subScriptWords);
-                    bulidingContext.CurrentNamespace.EndAndTryApplyUpdate();
-                    return null;
+                    if (swv.word == "{")
+                    {
+                        pause = Pause.Body;
+                        layer++;
+                    }
+                    return true;
                 }
                 else
                 {
-                    if (subScriptWords.TryGetValue(line, out var rline) == false)
-                    {
-                        subScriptWords.Add(line, rline = new());
-                    }
-                    rline.Add(wordIndex, next);
+                    throw new InvalidGrammarException($"Expected a script word variable for namespace name, but got {next}");
                 }
             }
-            return this;
+            else
+            {
+                if (next is Internal.ScriptWordVariable swv)
+                {
+                    if (swv.word == "{")
+                        layer++;
+                    else if (swv.word == "}")
+                        layer--;
+                    if (layer == 0)
+                    {
+                        return false;
+                    }
+                }
+                return true;
+            }
+        }
+    }
+
+    public abstract class VerbObjectScopeKeyword<T> : Internal.Keyword<T> where T : VerbObjectScopeKeyword<T>, new()
+    {
+        protected VerbObjectScopeKeyword(string keyword) : base(keyword)
+        {
+        }
+
+        private enum Pause
+        {
+            BeforeExpression, Expression, BeforeBody, Body, SingleSentence
+        }
+
+        private Pause pause = Pause.BeforeExpression;
+        private int layer = 0;
+
+        protected override bool ControlScope(SymbolizationContext context, Internal.Variable next)
+        {
+            if (pause == Pause.BeforeExpression)
+            {
+                if (next is not Internal.ScriptWordVariable swv)
+                    throw new InvalidGrammarException($"Not expected a key word: {next}");
+                if (swv.word == "(")
+                    pause = Pause.Expression;
+                else
+                    throw new InvalidGrammarException($"Expected '(' symbol for expression start, but got {next}");
+            }
+            else if (pause == Pause.Expression)
+            {
+                if (next is Internal.ScriptWordVariable swv && swv.word == ")")
+                {
+                    pause = Pause.BeforeBody;
+                }
+            }
+            else if (pause == Pause.BeforeBody)
+            {
+                if (next is not Internal.ScriptWordVariable swv)
+                    throw new InvalidGrammarException($"Not expected keyword for body start, but got {next}");
+                if (swv.word == "{")
+                {
+                    pause = Pause.Body;
+                    layer++;
+                }
+                else
+                    pause = Pause.SingleSentence;
+            }
+            else if (pause == Pause.Body)
+            {
+                if (next is Internal.ScriptWordVariable swv)
+                {
+                    if (swv.word == "{")
+                        layer++;
+                    else if (swv.word == "}")
+                        layer--;
+                    if (layer == 0)
+                        return false;
+                }
+            }
+            else if (pause == Pause.SingleSentence)
+            {
+                if (next is Internal.ScriptWordVariable swv && swv.word == ";")
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+
+    /// <summary>
+    /// <b><see langword="import"/> file</b>
+    /// </summary>
+    public sealed class Import : SentenceKeyword<Import>
+    {
+        public Import() : base("import")
+        {
+        }
+    }
+
+    /// <summary>
+    /// <b><see langword="namespace"/> name { ... }</b>
+    /// </summary>
+    public sealed class Namespace : NamespaceKeyword<Namespace>
+    {
+        public Namespace() : base("namespace")
+        {
         }
     }
 
     /// <summary>
     /// <b><see langword="def"/> FunctionName(parameter-list) return-type { ... return return-type-instance; }</b>
     /// </summary>
-    public sealed class FunctionDef : Internal.Keyword<FunctionDef>
+    public sealed class FunctionDef : NamespaceKeyword<FunctionDef>
     {
         public FunctionDef() : base("def")
         {
@@ -164,7 +231,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="return"/> symbol;</b>
     /// </summary>
-    public sealed class Return : Internal.Keyword<Return>
+    public sealed class Return : SentenceKeyword<Return>
     {
         public Return() : base("return")
         {
@@ -174,7 +241,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="if"/>(bool-expression) expression</b>
     /// </summary>
-    public sealed class If : Internal.Keyword<If>
+    public sealed class If : VerbObjectScopeKeyword<If>
     {
         public If() : base("if")
         {
@@ -182,9 +249,21 @@ namespace Convention.Symbolization.Keyword
     }
 
     /// <summary>
-    /// <b><see langword="if"/> expression <see langword="else"/> expression</b>
+    /// <b><see langword="if"/> expression <see langword="elif"/> expression</b><para></para>
+    /// <b><see langword="if"/> expression <see langword="elif"/> expression <see langword="elif"/> expression...</b>
     /// </summary>
-    public sealed class Else : Internal.Keyword<Else>
+    public sealed class Elif : VerbObjectScopeKeyword<Elif>
+    {
+        public Elif() : base("elif")
+        {
+        }
+    }
+
+    /// <summary>
+    /// <b><see langword="if"/> expression <see langword="else"/> expression</b><para></para>
+    /// <b><see langword="if"/> expression <see langword="elif"/> expression... <see langword="else"/> expression</b>
+    /// </summary>
+    public sealed class Else : NamespaceKeyword<Else>
     {
         public Else() : base("else")
         {
@@ -194,7 +273,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="while"/>(bool-expression) expression</b>
     /// </summary>
-    public sealed class While : Internal.Keyword<While>
+    public sealed class While : VerbObjectScopeKeyword<While>
     {
         public While() : base("while")
         {
@@ -204,7 +283,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="break"/>;</b>
     /// </summary>
-    public sealed class Break : Internal.Keyword<Break>
+    public sealed class Break : SingleKeyword<Break>
     {
         public Break() : base("break")
         {
@@ -214,7 +293,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="continue"/>;</b>
     /// </summary>
-    public sealed class Continue : Internal.Keyword<Continue>
+    public sealed class Continue : SingleKeyword<Continue>
     {
         public Continue() : base("continue")
         {
@@ -224,7 +303,7 @@ namespace Convention.Symbolization.Keyword
     /// <summary>
     /// <b><see langword="struct"/> structureName { ... }</b>
     /// </summary>
-    public sealed class Structure : Internal.Keyword<Structure>
+    public sealed class Structure : NamespaceKeyword<Structure>
     {
         public Structure() : base("struct")
         {
diff --git a/Convention/[Symbolization]/Runner/SymbolizationContext.cs b/Convention/[Symbolization]/Runner/SymbolizationContext.cs
index 4f4b204..d665dae 100644
--- a/Convention/[Symbolization]/Runner/SymbolizationContext.cs
+++ b/Convention/[Symbolization]/Runner/SymbolizationContext.cs
@@ -20,9 +20,9 @@ namespace Convention.Symbolization
 
         public void Compile(Dictionary<int, Dictionary<int, Internal.Variable>> scriptWords)
         {
+            new Internal.SymbolizationReader() { ScriptWords = scriptWords }.CompleteScopeWord(this);
         }
 
-
         public void Compile(string allText)
         {
             // Create a new reader to parse the script words
@@ -31,7 +31,7 @@ namespace Convention.Symbolization
                 reader.ReadChar(ch);
             var scriptWords = reader.ScriptWords;
             // Turn the script words into scope words
-            this.Compile(scriptWords);
+            reader.CompleteScopeWord(this);
         }
 
         public void Compile(ToolFile file)
diff --git a/Convention/[Symbolization]/Runner/SymbolizationReader.cs b/Convention/[Symbolization]/Runner/SymbolizationReader.cs
index 4eb9f57..2b6cbc4 100644
--- a/Convention/[Symbolization]/Runner/SymbolizationReader.cs
+++ b/Convention/[Symbolization]/Runner/SymbolizationReader.cs
@@ -106,28 +106,50 @@ namespace Convention.Symbolization.Internal
 
         #region Read Scope Words
 
+        private class KeywordEntry
+        {
+            public int line = 1;
+            public int wordIndex = 1;
+            public Dictionary<int, Dictionary<int, Variable>> Container = new();
+            public KeywordEntry(int line, int wordIndex)
+            {
+                this.line = line;
+                this.wordIndex = wordIndex;
+            }
+        }
+
+        private Dictionary<Keyword, KeywordEntry> ScopeWords = new();
+
         public void CompleteScopeWord(SymbolizationContext rootContext)
         {
-            int wordCounter = 1;
-            Internal.Keyword currentKey = null;
+            Keyword currentKey = null;
+            bool isNextKeyword = true;
             foreach(var line in ScriptWords)
             {
+                int wordCounter = 1;
                 foreach (var word in line.Value)
                 {
-                    if (currentKey == null)
+                    if (isNextKeyword)
                     {
-                        if(currentKey is Internal.Keyword cky)
+                        if (word.Value is Keyword cky)
                         {
                             currentKey = cky;
+                            ScopeWords.Add(currentKey, new(line.Key, wordCounter));
+                            isNextKeyword = false;
                         }
                         else
                         {
-                            throw new InvalidGrammarException($"Line {line.Key}, word {wordCounter}: Expected a keyword, but got {word}");
+                            throw new InvalidGrammarException($"Line {line.Key}, word {wordCounter}: Expected a keyword, but got {word.Value}");
                         }
                     }
                     else
                     {
-                        currentKey = currentKey.ControlContext(rootContext, line.Key, word.Key, word.Value);
+                        var container = ScopeWords[currentKey].Container;
+                        if (container.ContainsKey(line.Key) == false)
+                            container.Add(line.Key, new() { { wordCounter, word.Value } });
+                        else
+                            container[line.Key][wordCounter] = word.Value;
+                        isNextKeyword = currentKey.ControlScope(rootContext, line.Key, word.Key, word.Value) == false;
                     }
                     wordCounter++;
                 }