请问 had been separated 和having been separated的区别呢?

had been 请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法请问HAD BEEN 单复数用法有区别吗 had been doingwho had been work in...for a long timewho had been working in.for a long time我支持下面的,请问下面的对吗? It's been so long since I had been a teacher.请问这句好如何翻译? 请问 had been separated 和having been separated的区别呢? .there had never been any sounds like that.请问had been 怎么讲啊.被动语态吗》? From a separate till now,I had in my habit. what had been done had been done. It would be useless to speculate..It would be useless to speculate what might have been achieved had these two separate teams been unable to work hand in hand .这句中的had是什么回事?这句话有没有语法问题?还是一种倒装?had的倒 where had she been? had been什么时态 英语翻译had been reading if the teacher had been more careful ,i wouldn't have been so sad 请问这句话有没有错? She had been too proud to ask for help.请问这里的had been的意思 为什么后面不跟动词呢? 请问这句如何理解 my tongue was busy searching out the hole where the tooth had been?那The tooth had been in the hole呢? 请问：虚拟语气中什么时候be动词用were,什么时候用had been? 英语翻译另外,请问这句话有没有语法错误:All things had been over. 请问英语had been 是什么时态呢?在什么情况下用呢