Dear Mary,I have received your e-mail 这个为什么不用 I had receive your e-mail 呵呵,

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DearMary,Ihavereceivedyoure-mail这个为什么不用Ihadreceiveyoure-mail呵呵,DearMary,Ihavereceivedyoure-mail这个为什么

Dear Mary,I have received your e-mail 这个为什么不用 I had receive your e-mail 呵呵,
Dear Mary,I have received your e-mail 这个为什么不用 I had receive your e-mail 呵呵,

Dear Mary,I have received your e-mail 这个为什么不用 I had receive your e-mail 呵呵,
因为这里的have received是现在完成时的形式,即have done形式.
现在完成时用于两种情况:
1,过去发生的事对现在产生了影响,如:I have seen the film before.对现在产生影响,对这部电影熟悉了;
2,过去发生的事延续到现在,有可能还会发生下去,如:I have lived here for 5 years.我现在还住在这里,可能还会住下去.
讲得不是很完整,