have just been done和 was just done有什么区别啊在用法上的区别 应该如何判断

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• have just been done和 was just done有什么区别啊在用法上的区别 应该如何判断
• 英文语法问题having done与have been doing的区别She has apparently been dozing and,having come to just as the sentence ended,was attempting to cover for her inattention.书上说having done是非谓语动词做状语表示动作在谓语动作之前的用法,是现在分词的完成形式,have been doing这个是现在完成进行时不用说了,可是上面的例句里having come to...似乎是与前面的has been dozing一样都是主语she的谓语呀?为什么前一个用现在完成进行时,后一个用现在分词的完成式?究竟二者用法之间有什么区别呢?
• 1.have done 和 have been doing 是不是一样的.2.had done 和 had been done\doing 有什么区别3.过去式和 be done怎样区分啊这些事词是如何运用的.尽量讲简单一些可以吗?它们是如何运用的，可否举些例子。
• and that just may have been the best thing I have seen这里的may have done 什么作用?加了JUST和不加到底有什么区别？may have been 为什么不直接用may be 它们有什么区别？
• what did you do just now和 what have you just donewhat have you just done和what did you do just now 请不要复制别人答案 1 除了语法上时态不一样以外 意思上有没有区别 如果有区别 麻烦举两个例子 （我知道前者是对现在造成的影响 但是我想知道的是 在具体的对话中 如何体现出来）2 通常情况下 （老外对话的口语中）这两个句子能不能互换用
• have just been done和 was just done有什么区别啊
• The computer engineer starts to fix Annies computer 同意句The computer engineer 两格 Annie s computer
• 英语1.-What’s wrong with your coat?1.-What’s wrong with your coat?-Just now when I wanted to get off the bus,the man next to me ______ on it.a.sat b.had set c.had been sitting d.was sitting为什么