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

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 03:38:06
have been done have been doingis being done各叫什么?用法有什么区别?
x)H,KUHJMSHKU@fg9@,tBOv7 ?cMR>b@b(EAΆ~޷O

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

have been done have been doingis 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