diff --git a/version3.0/main.cpp b/version3.0/main.cpp
index ddd1392..a351861 100644
--- a/version3.0/main.cpp
+++ b/version3.0/main.cpp
@@ -45,6 +45,7 @@ void par_func()
 	if(!lexer.get_error())
 	{
 		parse.set_toklist(lexer.get_token_list());
+		parse.main_process();
 		if(parse.get_error()) std::cout<<">> [parse] error occurred,stop.\n";
 	}
 	else std::cout<<">> [lexer] error occurred,stop.\n";
diff --git a/version3.0/nasal.ebnf b/version3.0/nasal.ebnf
index 7de9ee0..d867bcc 100644
--- a/version3.0/nasal.ebnf
+++ b/version3.0/nasal.ebnf
@@ -26,16 +26,19 @@ argument_list::=
     '(' [{id ','} ([id '...']|{id '=' calculation ','})] ')'
 ;
 expressions::=
-    '{' {definition|assignment|calculation|loop|conditional} '}'
+    '{' {definition|assignment|calculation|loop|conditional|return_expr|continue_expr|break_expr} '}'
     |definition ';'
     |multi_assignment ';'
     |calculation ';'
     |loop
     |conditional
+    |return_expr
+    |continue_expr
+    |break_expr
 ;
 calculation::=
     '(' calculation ')'
-    |scalar_gen
+    |scalar
     |trinocular
     |and_expr
     |calculation ('=' | '+=' | '-=' | '*=' | '/=' | '~=') calculation
@@ -61,7 +64,7 @@ multive_expr::=
 unary::=
     ('-'|'!') calculation
 ;
-scalar_gen::=
+scalar::=
     function_call
     |identifier_call
     |vector_call
@@ -115,4 +118,13 @@ conditional::=
     if '(' calculation ')' expressions
     {elsif '(' calculation ')' expressions}
     [else expressions]
+;
+continue_expr::=
+    continue
+;
+break_expr::=
+    break
+;
+return_expr::=
+    return [calculation]
 ;
\ No newline at end of file
diff --git a/version3.0/nasal_ast.h b/version3.0/nasal_ast.h
index 7787fa2..84f64bb 100644
--- a/version3.0/nasal_ast.h
+++ b/version3.0/nasal_ast.h
@@ -12,6 +12,7 @@ public:
     nasal_ast();
     nasal_ast(const nasal_ast&);
     ~nasal_ast();
+    nasal_ast& operator=(const nasal_ast&);
     void clear();
     void set_line(int);
     void set_type(int);
@@ -47,6 +48,15 @@ nasal_ast::~nasal_ast()
     return;
 }
 
+nasal_ast& nasal_ast::operator=(const nasal_ast& tmp)
+{
+    this->line=tmp.line;
+    this->type=tmp.type;
+    this->str=tmp.str;
+    this->children=tmp.children;
+    return *this;
+}
+
 void nasal_ast::clear()
 {
     this->line=0;
diff --git a/version3.0/nasal_enum.h b/version3.0/nasal_enum.h
index b5eeb23..4b3e97e 100644
--- a/version3.0/nasal_enum.h
+++ b/version3.0/nasal_enum.h
@@ -20,21 +20,24 @@ enum token_type
 
 enum ast_node
 {
-    ast_null=0,
+    ast_null=0,ast_root,ast_block,
     ast_nil,ast_number,ast_string,ast_identifier,ast_function,ast_hash,ast_vector,
     ast_hashmember,
     ast_args,
     ast_for,ast_forindex,ast_foreach,ast_while,
-    ast_definition,ast_assignment,ast_calculation
+    ast_definition,ast_assignment,ast_calculation,
+    ast_continue,ast_break,ast_return,
 };
 
 enum parse_error
 {
     unknown,
+    error_token,
     lack_id,
     lack_left_curve,
     lack_left_bracket,
     lack_left_brace,
+    lack_semi,
     lack_comma,
     lack_colon,
     lack_scalar,
@@ -47,14 +50,16 @@ void error_info(int line,int error_type)
     std::cout<<info<<line<<": ";
     switch(error_type)
     {
-        case unknown:           detail="unknown error.";     break;
-        case lack_id:           detail="lack identifier.";   break;
-        case lack_left_curve:   detail="lack left curve.";   break;
-        case lack_left_bracket: detail="lack left bracket."; break;
-        case lack_left_brace:   detail="lack left brace.";   break;
-        case lack_comma:        detail="lack comma.";        break;
-        case lack_colon:        detail="lack colon.";        break;
-        case lack_scalar:       detail="lack scalar";        break;
+        case unknown:           detail="unknown error.";                    break;
+        case error_token:       detail="this token should not exist here."; break;
+        case lack_id:           detail="lack identifier.";                  break;
+        case lack_left_curve:   detail="lack left curve.";                  break;
+        case lack_left_bracket: detail="lack left bracket.";                break;
+        case lack_left_brace:   detail="lack left brace.";                  break;
+        case lack_semi:         detail="lack \';\' here.";                  break;
+        case lack_comma:        detail="lack comma.";                       break;
+        case lack_colon:        detail="lack colon.";                       break;
+        case lack_scalar:       detail="lack scalar";                       break;
     }
     std::cout<<detail<<std::endl;
     return;
diff --git a/version3.0/nasal_parse.h b/version3.0/nasal_parse.h
index f30380d..752361b 100644
--- a/version3.0/nasal_parse.h
+++ b/version3.0/nasal_parse.h
@@ -41,6 +41,9 @@ private:
     nasal_ast multi_assgin();
     nasal_ast loop();
     nasal_ast conditional();
+    nasal_ast continue_expr();
+    nasal_ast break_expr();
+    nasal_ast return_expr();
 public:
     int get_error();
     void clear();
@@ -73,11 +76,35 @@ void nasal_parse::set_toklist(std::vector<token>& lex_token)
 void nasal_parse::main_process()
 {
     this->reset();
+    root.set_line(1);
+    root.set_type(ast_root);
     while(ptr<tok_list_size)
     {
-        if(tok_list[ptr].type);
+        switch(tok_list[ptr].type)
+        {   
+            case tok_nil:case tok_number:case tok_string:case tok_identifier:
+            case tok_func:
+            case tok_left_bracket:case tok_left_brace:
+            case tok_sub:
+            case tok_not:   root.add_child(calculation()); break;
+            case tok_var:   root.add_child(definition());  break;
+            case tok_for:case tok_forindex:case tok_foreach:
+            case tok_while: root.add_child(loop());        break;
+            case tok_if:    root.add_child(conditional()); break;
+            defaut: error_info(tok_list[ptr].line,error_token);++error;break;
+        }
         ++ptr;
+        if(ptr<tok_list_size && tok_list[ptr].type==tok_semi)
+            ++ptr;
+        else if(ptr<tok_list_size && tok_list[ptr].type!=tok_semi
+            && !root.get_children().empty() && !root.get_children().back().get_children().empty()
+            && root.get_children().back().get_children().back().get_type()!=ast_function)
+        {
+            error_info(root.get_children().back().get_children().back().get_line(),lack_semi);
+            ++error;
+        }
     }
+    std::cout<<">> [parse] complete generation. "<<error<<" error(s)."<<std::endl;
     return;
 }
 
@@ -139,6 +166,7 @@ nasal_ast nasal_parse::vector_gen()
         if(ptr<tok_list_size && tok_list[ptr].type!=tok_comma && tok_list[ptr].type!=tok_right_bracket)
         {
             error_info(tok_list[ptr].line,lack_comma);
+            ++error;
             break;
         }
     }
@@ -159,6 +187,7 @@ nasal_ast nasal_parse::hash_gen()
         if(ptr<tok_list_size && tok_list[ptr].type!=tok_comma && tok_list[ptr].type!=tok_right_brace)
         {
             error_info(tok_list[ptr].line,lack_comma);
+            ++error;
             break;
         }
     }
@@ -179,11 +208,16 @@ nasal_ast nasal_parse::hash_member_gen()
     if(ptr>=tok_list_size || tok_list[ptr].type!=tok_colon)
     {
         error_info(ptr>=tok_list_size?node.get_line():tok_list[ptr].line,lack_colon);
+        ++error;
         return node;
     }
     ++ptr;
     if(ptr<tok_list_size) node.add_child(calculation());
-    else error_info(node.get_line(),lack_scalar);
+    else
+    {
+        error_info(node.get_line(),lack_scalar);
+        ++error;
+    }
     return node;
 }
 nasal_ast nasal_parse::func_gen()
@@ -195,16 +229,19 @@ nasal_ast nasal_parse::func_gen()
     if(ptr>=tok_list_size)
     {
         error_info(node.get_line(),lack_left_curve);
+        ++error;
         return node;
     }
     if(tok_list[ptr].type==tok_left_curve)
     {
         node.add_child(args_list_gen());
+        ++error;
         ++ptr;
     }
     if(ptr>=tok_list_size)
     {
         error_info(node.get_line(),lack_left_brace);
+        ++error;
         return node;
     }
     node.add_child(exprs_gen());
@@ -225,11 +262,43 @@ nasal_ast nasal_parse::args_list_gen()
 nasal_ast nasal_parse::exprs_gen()
 {
     nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_block);
+    while(ptr<tok_list_size)
+    {
+        switch(tok_list[ptr].type)
+        {   
+            case tok_nil:case tok_number:case tok_string:case tok_identifier:
+            case tok_func:
+            case tok_left_bracket:case tok_left_brace:
+            case tok_sub:
+            case tok_not:   node.add_child(calculation()); break;
+            case tok_var:   node.add_child(definition());  break;
+            case tok_for:case tok_forindex:case tok_foreach:
+            case tok_while: node.add_child(loop());        break;
+            case tok_if:    node.add_child(conditional()); break;
+            case tok_continue:break;
+            case tok_break:break;
+            case tok_return:break;
+            defaut: error_info(tok_list[ptr].line,error_token);++error;break;
+        }
+        ++ptr;
+        if(ptr<tok_list_size && tok_list[ptr].type==tok_semi)
+            ++ptr;
+        else if(ptr<tok_list_size && tok_list[ptr].type!=tok_semi
+            && !node.get_children().empty() && !node.get_children().back().get_children().empty()
+            && node.get_children().back().get_children().back().get_type()!=ast_function)
+        {
+            error_info(node.get_children().back().get_children().back().get_line(),lack_semi);
+            ++error;
+        }
+    }
     return node;
 }
 nasal_ast nasal_parse::calculation()
 {
     nasal_ast node;
+    node.set_line(tok_list[ptr].line);
     return node;
 }
 nasal_ast nasal_parse::trinocular()
@@ -332,5 +401,33 @@ nasal_ast nasal_parse::conditional()
     nasal_ast node;
     return node;
 }
-
+nasal_ast nasal_parse::continue_expr()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_continue);
+    return node;
+}
+nasal_ast nasal_parse::break_expr()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_break);
+    return node;
+}
+nasal_ast nasal_parse::return_expr()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_return);
+    ++ptr;
+    if(ptr<tok_list_size)
+    {
+        int type=tok_list[ptr].type;
+        if(type==tok_nil || type==tok_number || type==tok_string || type==tok_identifier || type==tok_func ||
+        type==tok_sub || type==tok_not || type==tok_left_curve || type==tok_left_bracket || type==tok_left_brace)
+            node.add_child(calculation());
+    }
+    return node;
+}
 #endif
\ No newline at end of file