For so many years 后面要用完成时态么?还是什么时态都可以?

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• For so many years 后面要用完成时态么?还是什么时态都可以?
• 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。
• 请分析下面英语句子结构及时态：The dream he had had for so many years ended there.整个句子是一般过去时吗?主语是The dream he had had for so many years ,ended是整句的谓语动词?he had had for so many years是一个定语从句,用来修饰The dream的,定语从句是过去完成时,第一个had表时态,第二个had是have（有）的过去分词?还有 he had had for so many years 作为定语从句,中间好像省略了连接词,省略的是什么?
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• For so many years 后面要用完成时态么?还是什么时态都可以?
• 直接引语转变为间接引语,为什么这个时态不变有个例子 teacher asked tom,"why were you late again?" 转后为 teacher asked tom why he was late again.时态变化不是 一般过去时变过去完成时么?这个为什么不变?还有一个例子 father asked him,"when did you go to bed last night" 转后 father asked him when he went to bed the night before那什么时候是一般过去时,什么时候是过去完成时,有没有一个规律的?还是都可以?
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