how to write the return?

[runeveryday]

function annotate_menu() {
$items['admin/settings/annotate'] = array(
'title' => 'Annotation settings',
'description' => 'Change how annotations behave.',
'page callback' => 'drupal_get_form',
'page arguments' => array('annotate_admin_settings'),
'access arguments' => array('administer site configuration'),
'type' => MENU_NORMAL_ITEM,
'file' => 'annotate.admin.inc',
);
return $items;
}

 

 

function annotate_admin_settings() {
$options = node_get_types('names');
$form['annotate_node_types'] = array(
'#type' => 'checkboxes',
'#title' => t('Users may annotate these content types'),
'#options' => $options,
'#default_value' => variable_get('annotate_node_types', array('page')),
'#description' => t('A text field will be available on these content types to
make user-specific notes.'),
);
return system_settings_form($form);
}

 

one the above ,there are two functions and each have a return value. but the return value all irregularly, now if i want to design a function how to write the  function's return.