Will have finished 是将来完成时，是指在将来某时间内会已经完成了某事，后面一般都会跟一个时间限定，比如I will have finished the homework by the time you come home.
例句
The work will have been finished by the time I come back.
到我回来时此工作将已完成。
www.worlduc.com
My homework will have been finished when you arrive tomorrow.
明天你到的时候，我的作业会已经做完了。
www.wesiedu.com
The book I'm working on will have been finished by the end of the year.
我正写的这本书今年年末将会完成。
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