一、将来完成时的结构

shall/will have+过去分词

二、将来完成时用法、定义详细讲解

1、表示将来某时之前或某动作发生之前已经完成的动作。
例句：
I shall have finished it by next Friday.到下周五我就把完成了。
She will have written it tomorrow at noon.明天中午她就会写好了。
They will have been graduated from the university before he returns from abroad.在他从国外回来之前他们就会大学毕业了。

2、表示一个持续到将来某时或某动作发生之前的动作。
例句：
By next Monday,she will have studied here for three years.到下周一，她在这里学习就要满3年了。
The concert will begin at half past eight.They will have played half an hour when you arrive.音乐会将在8点半开始。你到达时，他们将已经演奏半小时了。

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。
He will have arrived by now.他这是可能已经到了。
He is a somebody now.He will have forgotten his old friends.他现在是个要人了，可能把老朋友都忘了。
You’ll have heard that China will launch another spaceship.中国将要发射另一艘宇宙飞船，你可能已经听说了。