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She has been on duty yesterday是什么意思?和she was on duty yesterd

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She has been on duty yesterday是什么意思?和she was on duty yesterday有什么不同?
has been这个是一个固定搭配吗?后面一般跟什么?
she went to beijing和she has been to
have done又是什么？
She has been on duty yesterday是什么意思?和she was on duty yesterd
应该是She has been on duty since yesterday和she was on duty yesterday有什么不同?
前者是现在完成时 表示状态 从昨天 持续到现在
后者 是一般过去时 说明她昨天的情况 和现在没关系
be on duty 可以 看作是一个短语
she went to beijing和she has been to Beijing
前者是 一般过去时 她去北京了
后者是现在完成时 她去过北京 （ 但现在已经回来了 不在北京)
on duty in duty,on duty,off duty,duty free区别 Who is on duty today ?是什么意思 谢谢 Whos on duty today中文是什么意思 on duty音标急快啊 is on duty today on duty中的duty是动词吗 she has been in hospital since she was shot on the head 为什么要 Lucy is on duty today.Look!She is c______ the blackboard 问:空 Is Mrs White in the office?Yes,_she is on duty,she must be h Is Mrs White in the office? Yes,_she is on duty,she must be It was a cold night when he was on duty