FRONTEND_MVC/controllers/actions/PageAction.php

<?php
namespace app\controllers\actions;

use yii\base\Action;
use yii\base\Model;

class PageAction extends Action
{
    /**
     * Модель
     * @var Model
     */
    public $model;

    public function run()
    {
        return $this->controller->render('page', ['model'=>$this->model]);
    }
}