I shall have completed this.I shall have completed this novel by December.By then I __________________(work)on it for ten months.这道题的题目是用正确的时态填空,横线上的答案是:shall have been working.但不知道为什么,知道

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I shall have completed this.I shall have completed this novel by December.By then I __________________(work)on it for ten months.这道题的题目是用正确的时态填空,横线上的答案是:shall have been working.但不知道为什么,知道

I shall have completed this.I shall have completed this novel by December.By then I __________________(work)on it for ten months.这道题的题目是用正确的时态填空,横线上的答案是:shall have been working.但不知道为什么,知道
I shall have completed this.
I shall have completed this novel by December.By then I __________________(work)on it for ten months.这道题的题目是用正确的时态填空,横线上的答案是:shall have been working.但不知道为什么,知道的回答一下,请写出过程,
这道题为什么要用将来完成进行时?

I shall have completed this.I shall have completed this novel by December.By then I __________________(work)on it for ten months.这道题的题目是用正确的时态填空,横线上的答案是:shall have been working.但不知道为什么,知道
先说这句话的意思是:“我将会在十二月完成这部小说,到那时,我已经为它工作10个月了”.
这是一个未完成的事件,将来才完成的事件,所以用shall;
“到那时”指的是12月小说完成之时,所以用完成时have done形式;
最后由于写书这件事是持续进行的,所以用ing形式.
横线上其实是一个“将来完成进行时”.

因为后来的十个月里都在做这件事情,所以用现在进行时。
work的现在进行时是working

这个题目考的是将来完成时,具体解释如下:
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 have done sth.
2) 概念
a. 状态完成:表示某事继续到将来某一时为止一...

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这个题目考的是将来完成时,具体解释如下:
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 have done 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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首先,by then就是一个表示选定时间的词语.译为,到那时...have been doing sth有"一直做某事"的意思