將來完成時用來表示在將來某一時間以前已經(jīng)完成或一直持續(xù)的動作.經(jīng)常與before+將來時間或by+將來時間連用,也可與before或by the time引導的現(xiàn)在時的從句連用.
1) 構成will / be going to do sth.
2) 概念
a. 狀態(tài)完成：表示某事繼續(xù)到將來某一時為止一直有的狀態(tài).
b. 動作完成：表示將來某一時或另一個將來的動作之前,已經(jīng)完成的動作或一獲得的經(jīng)驗.
They will have been married for 20 years by then.
You will have reached Shanghai by this time tomorrow.
將來完成時的構成
將來完成時的構成是由"shall/will + have +過去分詞"構成的.
Before long he will have forgotten all about the matter.
不久他就會全然忘記這件事的.
He is somebody now. He will not have remembered his old classmates.
他現(xiàn)在是一個有身份的人了,他可能不會記得老同學了.
Will you have known Kevin for 10 years next month?
到下個月你認識凱文該有10年了吧?
將來完成時的用法
①表示在將來某一時間之前已完成的動作,并往往對將來某一時間產(chǎn)生影響.
We shall have learned 12 units by the end of this term.
到這個學期末,我們將學完12個單元.
By the time you get home I will have cleaned the house from top to bottom.
你到家之前我將把房子徹底打掃一遍.
②表示推測,相當于"must have done"結構.
You will have heard of this, I guess.
我想你已經(jīng)聽說過這件事了.
I am sure he will have got the information.
我相信他一定得到了這個信息.
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