將來(lái)完成時(shí)概念：
將來(lái)完成時(shí)用來(lái)表示在將來(lái)某一時(shí)間以前已經(jīng)完成或一直持續(xù)的動(dòng)作。經(jīng)常與before+將來(lái)時(shí)間或by+將來(lái)時(shí)間連用，也可與before或by the time引導(dǎo)的現(xiàn)在時(shí)的從句連用。
將來(lái)完成時(shí)的構(gòu)成與用法：
�。ㄒ唬�(gòu)成：will/shall have+過(guò)去分詞：
如：We hope it will have stopped raining before we set off for the picnic. 我們希望在出發(fā)去野餐以前雨就已經(jīng)停了。
I'll have done all the work by the time you are back this evening. 你們今晚回來(lái)的時(shí)候我就將做完所有的工作了。
（二）用法：
1、表示在將來(lái)某一時(shí)刻將完成或在另一個(gè)未來(lái)的動(dòng)作發(fā)生之前已經(jīng)完成的動(dòng)作。
注意：常與將來(lái)完成時(shí)連用的時(shí)間狀語(yǔ)有：
�、賐y(the time/the end of)+表示將來(lái)時(shí)間的短語(yǔ)和句子；
�、赽efore(the end of)+表示將來(lái)時(shí)間的詞語(yǔ)或句子；
�、踳hen, after等加上表示將來(lái)動(dòng)作的句子等。
例如：By the year 2050, scientists probably will have discovered a cure for cancer.
到2050年，科學(xué)家們可能已經(jīng)找到治愈癌癥的方法了。
By the time you arrive in London, we will have been staying in Europe for two weeks.
等你到達(dá)倫敦的時(shí)候，我們將已經(jīng)在歐洲呆了兩星期了。
2、在時(shí)間從句和條件從句中，現(xiàn)在完成時(shí)可以代替將來(lái)完成時(shí)，表示將來(lái)某時(shí)業(yè)已完成的動(dòng)作。
例如：You'll get to like the subject after you have studied it for some time.
在學(xué)習(xí)這個(gè)學(xué)科一段時(shí)間之后，你就會(huì)喜歡它的。
I'll go and see the exhibition as soon as I have finished my work. 我一做完作業(yè)就去看展覽。
3、將來(lái)完成時(shí)還可以表示"可能性"，或"設(shè)想"。
例如：It's five o'clock, they will have arrived home by now. 已經(jīng)五點(diǎn)鐘了，他們現(xiàn)在應(yīng)該已經(jīng)到家了。
將來(lái)完成時(shí)與一般將來(lái)時(shí)的比較：
1、有具體的時(shí)間狀語(yǔ)要用一般將來(lái)時(shí)。
如：Mr Smith will return home on the first Sunday next month. 史密斯先生將于下月的第一個(gè)星期日回家。
2、將來(lái)完成時(shí)的時(shí)間狀語(yǔ)一般用介詞by引入。
如：Mr Smith will have returned home by next month. 到下個(gè)月史密斯先生將已回到家了。
典例精析：
1、They_____on the program for almost one week before I joined them, and now we_____it as no good results have come out so far.
A. had been working; are still working
B. had worked; were still working
C. have been working; have worked
D. have worked; are still working
答案：A。
解析：不難看出第一空的動(dòng)作發(fā)生在I joined them以前，且持續(xù)了一個(gè)周，應(yīng)該用過(guò)去完成進(jìn)行時(shí)；and now說(shuō)明下面的動(dòng)作仍在進(jìn)行之中，應(yīng)該用現(xiàn)在進(jìn)行時(shí)。故選A。
2、Father_____for London on business up on my arrival, so I didn't see him.
A.has left
B.left
C.was leaving
D.had left
答案：D。
解析：由"I didn't see him"可知父親在我回來(lái)以前已經(jīng)離開(kāi)，動(dòng)作發(fā)生在過(guò)去某個(gè)動(dòng)作以前，故選用過(guò)去完成時(shí)。
3、The policeman's attention was suddenly caught by a small box which_____placed under the Minister's car.
A. has been
B. had been
C. was being
D. would be
答案：B。