function fields_menu() {
    $items["fields"] = array(
        'title' => 'test fields',
        'page callback' => 'drupal_get_form',
        'page arguments' => array('fields'),
        'access callback' => TRUE,
        'type' => MENU_NORMAL_ITEM,

    );

    return $items;
}

function fields() {

  $users = array(
    array('uid' => 1, 'day' => 'Mon',),
    array('uid' => 2, 'day' => 'Tue',),
    array('uid' => 3, 'day' => 'Wen',),
  );

  $header = array(
      'day' => t('day'),
    'work_time' => t('work_time'),
  );

  $options = array();
  foreach ($users as $user) {
    $options[$user['uid']] =array(
      'day' => $user['day'],

        'work_time' => array(
        'data' => array(
        '#type' => 'textfield',
        '#value' => 'your field1',
        '#size' => '8',
      ),
         ),
        );
  }

  $form['table'] = array(
    '#type' => 'tableselect',
    '#header' => $header,
    '#options' => $options,
    '#js_select' => FALSE,
    '#multiple' => TRUE,
    '#empty' => t('No users found'),
  );
    return $form;

}