be done 和be doing done

be done 和be doing done being done 和 be doing ;done ；doing ; be done ;to be done 的用法 need doing 和need to be done 英语 区分 doing to和 be doing,being done 和 to be being done . to be done=doing? be done 和 be done it 用must be done 和must be doing 造句 be well worth being done和be well worth doing will be doing 和will be done的区别 be doing done与will be done的区别 BE BEING DOING/BE BEING DONE/HAVE BEEN DONE done 和to be done 怎么分