diff --git a/balloon/abstract_syntax_tree.cpp b/balloon/abstract_syntax_tree.cpp
index c92f247..019a1e9 100644
--- a/balloon/abstract_syntax_tree.cpp
+++ b/balloon/abstract_syntax_tree.cpp
@@ -673,13 +673,23 @@ void abstract_syntax_tree::run_root()
 		else if(i->type==__while)
 		{
 			scope.add_new_block_scope();
-			i->run_loop();
+			int ret_type=i->run_loop();
+			if(ret_type==__return)
+			{
+				std::cout<<"[Runtime-error] line "<<line<<": incorrect use of break/continue."<<std::endl;
+				exit_type=__error_command_use;
+			}
 			scope.pop_last_block_scope();
 		}
 		else if(i->type==__ifelse)
 		{
 			scope.add_new_block_scope();
-			i->run_ifelse();
+			int ret_type=i->run_ifelse();
+			if(ret_type==__continue || ret_type==__break || ret_type==__return)
+			{
+				std::cout<<"[Runtime-error] line "<<line<<": incorrect use of break/continue."<<std::endl;
+				exit_type=__error_command_use;
+			}
 			scope.pop_last_block_scope();
 		}
 		if(exit_type!=__process_exited_successfully)
diff --git a/balloon/balloon_lexer.h b/balloon/balloon_lexer.h
index 0733b85..231d8fa 100644
--- a/balloon/balloon_lexer.h
+++ b/balloon/balloon_lexer.h
@@ -115,6 +115,8 @@ class resource_file
 					resource.push_back(' ');
 			}
 			resource.push_back('\n');
+			resource.push_back(';');
+			resource.pudh_back('\n');
 			return;
 		}
 		std::list<char>& get_resource()