I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别,

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IwillwriteaprefacewhenIhavefinishedthebook.和IwillwriteaprefacewhenIfinishthebook的区别,Iwillwriteaprefa

I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别,
I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别,

I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别,
I will write a preface when I have finished the book.
我完成这本书之后,就写序言.
I will write a preface when I finish the book.
我完成这本书,就写序言.
前一句强调完成,语气更重一些,也可以暗示这本书耗时较多.后一句由于没那么强调“完成”,“写序言”的比重就大一些.
两句都对,基本可以互换.

前者更强调已经完成
后者不强调动作的先后
可以通用

没有太大的区别,实际上口语中都通用的,只不过前者更强调完成时态,后者更强调告知而已。

I will write a preface when I have finished the book完成后写序言
I will write a preface when I finish the book 完成的同时写序言