SialoS

So after some time i done exactly what i wanted and i thought it would be nice to share.
@keesiemeijer Thank you for your help. i have changed the code based on your contribution.

So in Functions.php add

function c_parent_comment_counter($pid,$uid){
    global $wpdb;
    $query = "SELECT COUNT(comment_post_id) AS count FROM $wpdb->comments WHERE <code>comment_approved</code> = 1 AND <code>comment_post_ID</code> = $pid AND <code>user_id</code> = $uid AND <code>comment_parent</code> = 0";
    $parents = $wpdb->get_row($query);
    return $parents->count;
}

and in comments.php

global $current_user, $post;
$number_of_parents = c_parent_comment_counter($post->ID,$current_user->ID);
echo "parents: ".$number_of_parents;
if ( $number_of_parents >= 1 ) {
	echo '<nav class="withcomment">';
	comment_form( array( 'title_reply' => __( 'Reply' ) ) );
	echo '</nav>';
} else {
	echo '<span class="withoutcomment">' . comment_form( array( 'title_reply' => __( 'Your opinion' ) ) ) . '</span>';
}
?>

in style.css

.withcomment {
	display: none;
}

This will count how many parent comments a user added and if its one or more it will hide the form. if its 0 it will show the form. but when you click the reply button the form will show and you will be able to reply to any comment.
THIS IS NOT HACK PROOF!!!

Hello,

I think i can do it if i show in both cases the comment form but hide it conditionally in the places that i want based on css classes.
but i have problem with my syntax if you can help.
this is my code:

<?php
global $current_user,$post;
$args = array('user_id' => $current_user->ID,'post_id' => $post->ID);
$usercomment = get_comments($args);
if(count($usercomment) >= 1){
 <nav class="commentifrated">
comment_form();
</nav>
} else {
<span class="commentifnotrated"> comment_form(); </span>;
 }
?>

and i get this error
Parse error: syntax error, unexpected ‘<‘ in