将来完成时 - 将来完成时-课件·PPT.ppt

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。
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
3 将来完成时通常与:“by+将来时间”和"by the time that"结构连用
。例如: ① By the year 2050, scientists probably will have discovered a cure for cancer. 到2050年,科学家们可能已经找到了治愈癌症的方法。 ② By the time you arrive in London, we will have been staying in Europe for two weeks. 等你到达伦敦的时候,我们已经在欧洲呆了两星期了。
4. 在时间从句和条件从句中,现在完成时可以代替将来完成时,表示将来某时业已完成的动作。
例如: ① You'll get to like the subject after you have studied it for some time. 在学习这个学科一段时间之后,你就会喜欢它的。 ② I'll go and see the exhibition as soon as I have finished my work. 我一做完作业就去看展览。
5. 将来完成时还可以表示“可能性”,或“设想”
。例如: It's five o'clock, they will have arrived home by now.  已经五点钟了,他们现在应该已经到家了
将来完成时的构成形式如下:
肯定式疑问式否定式疑问否定式
I shall Shall i I shall not Shall i not
have worked have worked? have worked have worked
He (she it) will have Will he (she it) He (she it) will Will he (she it) worked have worked ? not have worked not have worked?
We shall Shall we We shall Shall we
have worked have worked ? not have worked not have worked?
You will Will you You will Will you
have worked have worked ? not have worked not have worked?
They will Will they They will Will they
have worked have worked ? not have worked not have worked?
现在完成时、过去完成时与将来完成的区别
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,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