have been done为什么只做状语不作定语

you have done me a great service.为什么用have done,为什么不用have been must have been done must have done have been done为什么只做状语不作定语 have done 和gave been done的用法last night it must have been rained为什么错 雨是被下的,所以我觉得应该用have been done. have been done 和 to be done All that can be done___A.have been done B.have done C.has been done D.has done为什么选C怎么解释? 完成时被动语态为什么是have been done为什么不是 have be done什么情况下 be变成been have been done 语法呢 how long have you done that为什么done 处不能用been doing all that can be done has been done 为什么要用has,不用have has been doing have been done区别 being done,have been done和having done怎么分辨 HAVING BEEN DONE和HAVE BEEN DONE有什么区别? could have been done ,could have have been done和 have done什么区别?English has been taught in China for many years.(中国教英语已经多年.)有没有been?为什么? 虚拟语气 if You could have done other career What would it have been 为什么不是 if ..Had done 句 have done 与have been done的区别 have done和have been done 的区别,