it has been done 谓语it has been done 这句话done作表语还是been done做谓语?

it has been done 谓语it has been done 这句话done作表语还是been done做谓语? 英语翻译“how long it has been since i have done something 最好结合情景举个例 怎么分辨谓语动词和非谓语动词啊?比如,has caused /to be done /having been done/啊什么的? It's no use regretting what has been done. “I never see what has been done ,I only see what remains to be done. I don't think anything that has been done can be done.怎么翻译 can be done has been Everything that can be done has been done 中can be done has been done ------work has been done,has it?A.few B.a few C.little D.a little has been doing have been done区别 Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句 There is nothing new under the sun.It has all been done before.There is nothing new under the sun.It has all been done before. I think I have tried my best.All that can be done ___.A.has done B.has been done C.had done D.had been done为什么选B不选D ----Has Tom finished his home work yet?----I have no idea;he[ ] it this morning.A.was doing B.had been doing C.had done D.did has been done,had been done 的区别是什么? I think have tried my best.All that can be done ___ .A.has done B.has been done C.had done D.had been done为什么选B 非谓语动词中being done ,done,having been done,have done 有什么区别 It is said that all which can be done has been done.这个句子哪里错了 There is nothing new under the sun.It has all been done before.