to be done的用法

to be done的用法 being done 和 be doing ;done ；doing ; be done ;to be done 的用法 be sorry to have done的用法 to be done 和having been done的用法 到底有无with to be done的用法. 有没must to be done这种用法的? 英文want的用法want sth done与want sth to be done 的区别 be used to have done是什么用法? have been done与be done的区别和用法 to do 、 to be done的用法,举例（求详解） to have done,to be done,to have been done,having done在用法上有什么 怎样使用 with+名词+to be done 的独立主格的用法