You can enable threaded comments for posts using a simple trick. WordPress does not enable threaded comments by default, but you can do it using this code in functions.php
function ax_threaded_comments(){ if (!is_admin()) { if (is_singular() AND comments_open() AND (get_option('thread_comments') == 1)) wp_enqueue_script('comment-reply'); } } add_action('get_header', 'ax_threaded_comments');
Thanks to wpshout for this trick.