Question

will have done是什么时态

Answer 1

将来完成时。将来完成时的构成：shall/will+have+动词过去分词，有三种用法。1.表示将来某个时间势必会完成或者预计要完成的动作，如，I will have learned 4000 words by next year. 2.表示某种状况将会持续到说话人所提及的未来某一时间，如，We will have been married a year on June25the.
3.表示对现在或将来可能已经完成动作的推测，对过去实况的推测，如，He will have arrived by now.

Answer 2

一般将来时完成时态，表示到将来的某个时候已经完成某事。
如： I will have finished my middle school life in two years.
两年后我将完成我的中学生活。