将来
将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作
将来完
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
   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 K