public function mainform($player){
       $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
        $form = $api->createSimpleForm(function (Player $player, int $data = null){
            $result = $data;
            if($result === null){
                return true;
            }
            switch($result){
                    case "0";
                     $this->eng($player);
                    break;
                    case "1";
                     $this->vie($player);
                    break;
                    case "2";
                    break;
            }
            });
            $form->setTitle("§7Server §cTutorial");
            $form->setContent(
            "§7Server §eEvents §cFast §aBroadcast§7:\n\n".
            "§eHãy đọc hướng dẫn trước khi chơi để biết các tính năng hấp dẫn của sv.\n"

            "§e/htp §7để bật hướng dẫn\n\n".
            "§7Choose your §elanguage§7 to see §bhelps§7:"
            );
            $form->addButton("English",0,"textures/ui/generic_face_button_down");
            $form->addButton("Vietnamese",0,"textures/ui/generic_face_button_right");
            $form->addButton("Thanks,Im good!",0,"textures/ui/permissions_visitor_hand_hover");
            $form->sendToPlayer($player);
            return $form;

   }