be的过去分词形式是been。been的意思是曾经到过（某地）。been的例句：A new system has been devised to control traffic in the city（控制城市交通的新系统已经设计出来）。

been的例句：There have been many changes in recent years（近几年发生了许多变化）；The information has been placed in the public domain（这资料不受版权保护）。