it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?

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• been a pleasure and honor to serve my country.It's been到用法是美式到还是英式到?还是说通用?同时想问一下考研英语的长难句用那些辅导教材好?最好找到当当到地址谢谢.第四楼明显在做广告……这点语法知识我还不懂吗?高中我英语可是全校最好的分子之一,别再吹了.不过对于课本以外的英语知识,特别是一下地方语言用法不懂.不过还是感谢你告诉我It's been=it has been.我还没见过这样子的写法.
• whom has the letter been sent ?sent后面要填一个介词怎么填?如果可以的话把填完后的句子结构和这里牵涉到的语法说明一下.谢了!这里为什么用whom而不用who
• It's been a wonderful evening.这么说对不对?It's been a wonderful evening.语法上有问题没?been用的对么,怎么感觉得改成being?It's能是It has的缩写么?语法都忘记了,求教育.
• 是不是某些情况下用完成时态和过去时态都可以?背景是,我前几天让Mary送一些文件过去给对方,但是对方发信说没有收到,并且请尽快送来.于是我确认了一下,发现M确实已经送去,所以回信告诉对方.可以用I confirmed with Mary,and the paper was sent to you.表达么?还是应该用I have confirmed with Mary,and the paper has been sent to you.到底用完成时态还是用过去时态?都可以么?什么情况下可以没有区别?完成时态是对现在有影响的过去动作，关键怎么区别对待对现在有没有影响啊？这个句子有人给我讲说是可以用过去式的，也可以用过去完成表示强调对现在有影响。
• 这几句英文怎么翻译?（麻烦简单解释一下对应的中文背景原理,关于贸易的）There is no pie in the sky speculation.The biggest success in Kenya's economy over the past decade has been the boom in exports of cut flowers and vegetables to Europe.But that ma all change in 2008,when Kenya will be slightly too rich to qualify for the "least developed country"status that allows African prodfucers to avoid paying stiff European import duties on selected agricutural products.
• 麻烦帮我检查一下,这里的英语时态有没有错误,谢谢!再帮我写上以下16种时态分别的用法（就是他们的意思=在什么情况下用）,最好用你们自己理解的方式来告诉我,因为书本上写得太规范僵硬,我不太容易理解一般现在时：do现在完成时：have/has done现在进行时：be doing 现在完成进行时：have/has been doing一般过去时：did过去完成时：had done过去进行时：were/was doing过去完成进行时：had been doing一般将来时：shall/will do将来完成时：shall/will have done将来进行时：shall/will be doing将来完成进行时：shall/will have been doing一般过去将来时:should/would do过去将来完成时：should/would have done过去将来进行时:should/would be doing过去将来完成进行时：should/would have been doing
• it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?
• 请问一下I have been to shanghaiI have been to shanghai还原成一般现在时怎么还?如果been对应是的am I am to shanghai又错在哪?谁知道的,麻烦告诉一声,谢谢?
• it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?
• It was 可缩写为It's
• she's 是所有格吗