I have been here since I was born 和I haden't seen him since he left NANJING.两句话为什么用的不是相同的时态?

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I have been here since I was born 和I haden't seen him since he left NANJING.两句话为什么用的不是相同的时态?

I have been here since I was born 和I haden't seen him since he left NANJING.两句话为什么用的不是相同的时态?
I have been here since I was born 和I haden't seen him since he left NANJING.两句话为什么用的不是相同的时态?

I have been here since I was born 和I haden't seen him since he left NANJING.两句话为什么用的不是相同的时态?
简单的说,两个句子的主句都是可以延续的动作：我一直在这,我再没见过他,都是可以延续的；而我出生和他离开南京是两个瞬时的行为,我总不能是一直在出生,他总不能一直保持离开这个行为.所以两个句子的主句都是完成时,从句都是过去时.

如果这两句话 用相同的时态也都是正确的句子。这里用不同的时态是因为具体环境不同。前者的时间标准是“现在”，后者是“现在之前的某个时候”，您不妨再看看原句子的环境。

没有haden't这个字， 是 hadn't
I have been here since I was born 是自从我出生后，我一直是在这里，目前也还在这里
hadn't seen him since he left NANJING 自从他离开南京后，我就没有见过他 （讲的是过去的事情）

I have been here since I was born ------现在完成时
I haden't seen him since he left NANJING ------过去完成时

i have been here many a I HAVE BEEN HERE SINCE TIME o,i have been here before是什么意思 i have never been here还是i have never been in here I have been here 与I have been living here一样吗?有点弄不清楚. I have been here before.Is this correct?我曾经在这里.1）I have been here before.2）I have been here. I have lived here since then还是I have been here since then对啊? I have already been here for 5years =I have been here_____5 years______ I have been here to meet you again I have been here ( )1980要填什么 I have been to you here这句话是什么意思 I have been here for three months.同义句 i have been here ( )a year.A,since B,for i have been here for three months同义句 I have been here since three yeas ago 请问“I shouldn't have been here.”怎么翻译? I have been working here for 7 years.改为同义句怎摸说形如I have been working here— — — i have know him since i have been here.为什么不成立