be used是动词的被动语态。而used是过去式。或者过去分词。

    例如：1) Our time and money have been used.2）We should use our time to do something useful.

3) With the money used up,they had to hunt for a new job.

     be used to do something被用来做某事;be used to something/be used to doing sth习惯于某事/习惯于做某事;used to do something过去常常做某事。

be used和used的区别 扩展

单独的be used 可以做“被用来，被用做”，用于被动语态；used常和to连用，意思是“过去常常”