备注 1. 常用的时间状语一般用by+将来的时间，如：by the end of this year, by 8 o’clock this evening, by March next year以及由by the time…, before或when等引导的副词从句，如：
By the time you reach the station, the train will have left.
By next Tuesday, I will have got ready for the exams.
2. 在时间和条件状语从句中，将来完成时则由现在完成时表示，如：
The children will do their homework the moment they have arrived back from school.

将来完成时的用法:
①表示在将来某一时间之前已完成的动作，并往往对将来某一时间产生影响。
Pick me up at 8 o'clock,I will have had breakfast by then.
早上8点钟你来接我，到时我已经吃完早饭了。
We will have learned 12 units by the end of this term.
到这个学期末，我们将学完12个单元。
By the time you get home I will have cleaned the house from top to bottom.
你到家之前我将把房子彻底打扫一遍。
②表示推测，相当于"must have done"结构。
You will have heard of this, I guess.
我想你已经听说过这件事了。
I am sure he will have got the information.
我相信他一定会得到这个信息。
③.表示某种状态一直持续到说话人所提及的时间。
We will have been married a year on June 25th.
到6月25日我们俩结婚就满1年了。