Please give me the rewrite rules for my ugly urls

if you are trying to get

• http://www.myblog.com/currentpage/1
• http://www.myblog.com/currentpage/2

then your function should be

add_action('generate_rewrite_rules', 'currentpage_rewrite_rule_222');

function currentpage_rewrite_rule_222($wp_rewrite){
  $newrules = array();
  $new_rules['currentpage/(\d*)$'] = 'index.php?currentpage=$matches[1]';
  $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}

and just keep your query_vars function the way it is.

 add_filter('query_vars', 'wpa3537_query_vars'); 
    function wpa3537_query_vars($query_vars) {     
        $query_vars[] = 'currentpage';     
        return $query_vars;
    }