to have done,to be done,to have been done,having done在用法上有什么区别?

have been done 和 to be done be believed to have done have sth to be done/have sth done?为什么要用have anyting to be done? have something done 与have sth.to be done 区别 have sth to be done造句 be used to have done是什么用法? be sorry to have done的用法 homework______on time will lead to better grades.a.be done b.done c.having done d.to have been done请问该如何选择,能不能选D? pretend to be done是什么时态?pretend to be doing pretend to have done pretend to have been done呢? Homework ( )on time will lead to better gardes.A.done B.be done C.having done D.to have been done要说明原因哦。 to have done,to be done,to have been done,having done在用法上有什么区别? 关于英语非谓语问题非谓语doing having done to do to have done to be doing being done have been done to be done to have been doing done doing,having done,to do,to have done ,to be doing,being done,have been done,to be done,to have been doin More amd more people have realised we won't have cleaner water to drink unless something _____ soonA.was done B.will be done C.to be done D.is done请详细讲讲,另外,be done在这里是什么意思 to be done to have been done to have been doing 形式的造句, 歌曲中含有TO DO ：TO BE DONE ：TO HAVE BEEN DONE ：TO HAVE DONE是班主任让查的, Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollution.A.was done B.will be done C.to be done D.is done Something will have to be done to change ___. be thankful to do / to have done 举个例子