comment_form（）不起作用（Wordpress）

I try to add comment form to my custom template of page but it doesn't work (I mean the comment form does not appear). I don't know why because I think it must work. Template file reviews.php:

<?php 
/*
 * Template Name: Reviews
 */
 get_header(); ?>
<div class="container page">
    <h2>Отзывы</h2>
    <?php comment_form();?>
</div>
<?php get_footer(); ?>

Structure of folder with theme: structure screenshot

Could you tell me please what is a reason of my problem? Thank you!

YOU must enter in admin and check in if commments are open in this specific post-type/page.

Im not sure but... Pages for example, dont show commments by default

Just enter admin pages and enable comments and form need to appear..

    <?php comment_form();?>

    <?php

// Other way calling comments.php. If comments are open or we have at least one comment, load up the comment template
if ( comments_open() || '0' != get_comments_number() ) :

    comments_template();

endif;

?>

i dont see any comment template in your files. and i dont know if wp support/work nicely without this for discussions.

so my suggestion is copy comments.php file from any wp defult template. or just create comments.php file in your theme.

if ( comments_open() || '0' != get_comments_number() ) :
comments_template();
//this will load comments.php 
// and course will call comment_form function too..
endif;

Another valid option is enable disqus plugin to handle site comments