1. 将来完成；will/shall +have+done shall 用于第一人称，will 用于各种人称。
即表示到将来某个时间为止势必会完成或将要要完成的动作。如：
Maybe by then you will have changed your mind. 也许到时候你已经改变主意了。
“You'll have finished by tomorrow.” “I wish!” “你到明天就完成了。”“但愿如此! ”
I hope I'll have finished the work by the end of the month. 我希望我这个月底能完成工作。
Planning so far ahead makes no sense—so many things will have changed by next year. 提前这么久就计划并不明智——到明年，许多事情都会发生变化。
2. 表示动词的持续
即表示某种状况将一直持续到说话人所提及某一将来时间。如：
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。
By this time next week, I will have worked for this company for 24 years. 到下星期此刻，我已经为该公司干了24年了。
1. 将来完成；will/shall +have+done shall 用于第一人称，will 用于各种人称。
即表示到将来某个时间为止势必会完成或将要要完成的动作。如：
Maybe by then you will have changed your mind. 也许到时候你已经改变主意了。
“You'll have finished by tomorrow.” “I wish!” “你到明天就完成了。”“但愿如此! ”
I hope I'll have finished the work by the end of the month. 我希望我这个月底能完成工作。
Planning so far ahead makes no sense—so many things will have changed by next year. 提前这么久就计划并不明智——到明年，许多事情都会发生变化。
2. 表示动词的持续
即表示某种状况将一直持续到说话人所提及某一将来时间。如：
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。
By this time next week, I will have worked for this company for 24 years. 到下星期此刻，我已经为该公司干了24年了。