used to和be used to的区别?哪个表示过去?

used to和be used to的区别?哪个表示过去? used to和be used to的用法以及区别 Used to have 和 used to be 的区别 used to be和used to being的区别 used to和be used to的区别? used to和be used to的意思及区别 used to be 和 used to do 的区别 used to和 used to be的区别 be used to 和 used to do 的区别 used to／be used to／be used for的区别 use to,be used to do,be used to doing和be used for的区别 used to do,be used to doing和 be used to do的区别,并举例说明