have been done

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/24 04:44:33

have been done
have been doing
is being done
各叫什么?用法有什么区别?

have been done 现在完成时的被动语态,表示在过去某个时间点之前动作已经被完成
have been doing 现在完成进行时的被动语态,表示过去的动作到现在仍在进行
is being done 正在进行时的被动语态,表示现在正在进行的动作

MUST have been done being done,have been done ,have done,done must have been done must have done have done and have been done have done、 have been done的区别 have been done和 have done have done和have been have been done 和 have been doing must have been done/must be done have been done 和 to be done have been done的用法 have been done 语法呢