请具体解释、分析、区别 :be used for ; be used as ; use to.

请具体解释、分析、区别 :be used for ; be used as ; use to. be used for/be used as/be used to/be used by 的区别 use to,be used to do,be used to doing和be used for的区别 be used as .be used to .be used for .be used to doing.used t be used to doing,be used to do,used to do,be used for,be use be used for be used to be used from区别 用used to ,get used to ,be used for ,be used as ,be used by 的 used to／be used to／be used for的区别 be used for /be used to /used to区别~ Be used as 与be used for 有什么区别? use to,be used to,get used to的区别 用be used to,be used for,be used by,be used as,be used in 的适当