将来完成时的构成是由“shall/ will + have +过去分词”构成的。
Before long he will have forgotten all about the matter.
He is somebody now. He will not have remembered his old classmates.
他现在是一个有身份的人了,他可能不会记得老同学了。
Will you have known Kevin for 10 years next month?到下个月你认识凯文该有10年了吧?