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I am sorry that I write back to you (for) I (have received)y

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I am sorry that I write back to you (for) I (have received)your letter for three weeks.为什么用for
I am sorry that I write back to you (for) I (have received)your letter for three weeks.
为什么用for
为什么用 have received?
I am sorry that I write back to you (for) I (have received)y
非常抱歉,(for的意思因为)我(已经收到你信件)三周了才给你回信.
for表 原因的表语从句,意思是因为.
至于have received是过去完成时,强调已经收到来信!