英语将来完成时的语法知识点分析
英语的将来完成时表示表示一个持续到过去某时的动作。我们对未来总会有很多推测或期许，这时候就需要用到英语中的将来完成时了。下面小编给大家分享了有关将来完成时的英语语法知识，一起来看看吧!
将来完成时的分类
将来完成时：
1.构成：shall / will have + 过去分词
2.功能：表示将来某时之前已经完成的动作。
→They will have been here for 5 years next Friday.
→By the end of next term, the students will have finished the book.
过去将来完成时：
1.构成：would / should have + 过去分词
2.功能：表示从过去某个时间看将来某时之前已经完成的动作。
→He said that they would have arrived by seven o'clock.
将来完成进行时：
1.构成：shall / will have been + 现在分词
2.功能：表示某一动作将继续到将来某时，且该动作此时尚未发生。
→We shall have been staying here for four weeks when Tom arrives.
→It will have been raining for a week if it does not stop tomorrow.
[注：此句型过于复杂，人们很少运用，了解而已。]
将来完成的构成
将来完成时的构成方法是“will have +过去分词”。如：
Hopefully after three years at university I will have matured. 希望3年大学生活之后我能变成熟。
Only five short years later, your money will have grown by $94,000. 仅短短 5 年时间后，你的钱就会增多 94,000 美元。
He will have been heartened by the telephone opinion poll published yesterday. 他会为昨天公布的电话民意调查结果感到鼓舞。
将来完成时的主要用法
1. 表示将来完成
即表示到将来某个时间为止势必会完成或预计要完成的动作。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。
Demand for cars in the developed world will have reached saturation point within 20 years. 不出20年，已发展国家的汽车需求将达到饱和。
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。
3. 表示推测
即表示根据某情况作出的推测。如：
That will have been Roland. He said he'd be back at 7. 准是罗兰，他说他7点钟回来。
There will have been a definite result before Friday. 星期五以前将肯定会有结果。
将来完成通常搭配的状语
1. 用作状语的介词短语
There will have been a definite result before Friday. 星期五以前将肯定会有结果。
By next Christmas we'll have been here for eight years. 到下一个圣诞节，我们在这儿就住了整8年了。
By now you will have guessed that I'm back in Ireland. 你现在应该已经猜出我回到了爱尔兰了。
By the end of next week, I will have been a teacher for 25 years. 到下周末，我当老师就有25年了。
We'd better wait till 14 December. David will have had his exam by then, so he'll be able to enjoy himself. 我们最好还是等到12月14日。到那时大卫就考完试了，这样他就能够玩得痛快。
2. 用作状语的从句
If I don't run, the train will have left.(www.yygrammar.com) 如果我不跑，火车就会开走了。
If he turns it down, he will have lost the moral high ground to the president. 如果他拒绝的话，就会把精神上的优势输给总裁。
If you finish this job as well, you will have done far more than I expected. 假如你将这项工作干完的话，那你会干得比我预料的要多了。
If there was any scandal in that company, you can be sure that Bobby will have clocked it. 那家公司有任何丑闻，博比肯定会知道。
现在完成时、过去完成时与将来完成的区别
1. 现在完成时以现在时间为参照点，表示在“现在”以前完成的动作或持续到“现在”的状态;
2. 过去完成时则以过去时间为参照点，表示在“过去”某一时间以前发生的动作或持续到“过去”某一时间的状态;
3. 将来完成时则以将来时间为参照点，表示在“将来”某一时间为止已经完成的动作或持续到“将来”某一时间的状态。
请看例句：
He has finished writing his novel. 他已写完了他的小说。
He had finished writing his novel by the end of last year. 去年年底他就写完他的小说。
He will have finished writing his novel by the end of next year. 到明年年底他就会写完他的小说了。
与一般现在时代替一般将来时一样，在表示时间或者条件的状语从句，通常要用现在完成时来表示将来完成时，而不能直接使用将来完成时：
I will go with you when I have finished my work. 等我完成工作之后我就同你去。
若不强调动作的完成(且不至于引起歧义)，有时也可用一般现在时：
I will go with you when I finish my work. 我完成工作后就同你去。
