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.

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. because/since/as/ forbecause /as /since/ for 有什么区别..请讲具体点~另外,be used to do 和 used to do 有什么区别? I——frustrated when I did not know the answerA may beB used toC used to beD use to be请给我具体的解释 used to 与be used to 的区别具体应该怎么用? can be used ,will be used 区别 used to和 be used to的区别谁能给我解释下 be used for be used to be used from区别 used to／be used to／be used for的区别 used to与be used to doing用法区别还有其他几个used to be used to doing sth be used to do 另外以上几个词各自用于什么时态中、表示什么具体含义呢? The city is not what it used to be.used to be在这里这么解释?这个城市不再是先前的模样了.what it used to be这个从句具体怎么解释?特别是be . be used for /be used to /used to区别~还有个be used for啊 be used to doing,be used to do,used to do,be used for,be used by有什么区别. 消费量与需求量的区别?我想请问一下,消费量与需求量具体概念及区别是什么?从实际生活经验上来分析，请解释消费量等同于需求量吗？ be used to doing/be used with的区别 be used for和be used from的区别 be used for与be used to的区别 Be used as 与be used for 有什么区别? be used as 和 be used by 区别