1） 将来完成时构成：will / be going to do sth.

2） 将来完成时概念

a. 状态完成：表示某事继续到将来某一时为止一直有的状态。

b. 动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或一获得的经验。

例句：

They will have been married for 20 years by then.

You will have reached Shanghai by this time tomorrow.