to be up for和be up for的区别

to be up for和be up for的区别 be up for sale 和be for sale区别说明 to be up for的用法 be used to do 和be uesd for 的区别 be leaving for和be leaving to的区别 be important to 和be important for的用法区别 be intended to do 和be intended for 的区别 be bad to和be bad for的区别? be useful to和be useful for的区别 be necessary for和 be necessary to的区别 be to blame和be blamed for的区别 be useful to和be useful for的区别?