关于英语将来完成时搞不清楚~比如这一句We shall have learned 12 units by the end

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/11 09:53:29

关于英语将来完成时
搞不清楚~
比如这一句
We shall 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.
按照江来完成时的意义,也就是说这个学期末之前,我们就怎么怎么样.
不通啊!
还有这个
Before long , he will have forgotten all about the matter.
过不久,他就会把这件事全然忘记的.
When I have done that, I shall have done all that I was suppose .
By the time he is twenty, he will have finished the novel.
我觉得这句话应该这么做啊
When he is twenty,he will finish the novel.
怎么一会儿将来时,一会儿一般现在时,一会儿现在完成时的.
把我搞糊涂了~
谁能讲明白~
谢绝复制长篇大论的东西.谢谢!

将来完成时
将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作.经常与before+将来时间或by+将来时间连用,也可与before或by the time引导的现在时的从句连用.
1) 构成will / be going to do sth.
2) 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.
They will have been married for 20 years by then.
You will have reached Shanghai by this time tomorrow.
将来完成时的构成
将来完成时的构成是由"shall/will + have +过去分词"构成的.
Before long he will have forgotten all about the matter.
不久他就会全然忘记这件事的.
He is somebody now.He will not have remembered his old classmates.
他现在是一个有身份的人了,他可能不会记得老同学了.
Will you have known Kevin for 10 years next month?
到下个月你认识凯文该有10年了吧?
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.
We shall 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.
我相信他一定得到了这个信息

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