一、過(guò)去將來(lái)完成時(shí)和將來(lái)完成時(shí)從字面的意思上看，它們的區(qū)別就在于時(shí)間，過(guò)去將來(lái)完成時(shí)，強(qiáng)調(diào)的是過(guò)去的時(shí)間，而將來(lái)完成時(shí)強(qiáng)調(diào)的是將來(lái)的時(shí)間，兩者都是在將來(lái)的時(shí)間事情已經(jīng)完成，例如：
1. The day was not so far when we would have finished this project.
我們完成這個(gè)項(xiàng)目的日子不遠(yuǎn)了。
2. He said he would have done with my camera by the end of next month.
他說(shuō)到下月底就不用我的照相機(jī)了。

二、將來(lái)完成時(shí)是用在表示在將來(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短語(yǔ)引導(dǎo)的現(xiàn)在時(shí)的從句連用。例如：
1.Before long he will have forgotten all about the matter.
不久他就會(huì)全然忘記這件事的。
2.He is somebody now. He will not have remembered his old classmates.
他現(xiàn)在是一個(gè)有身份的人了，他可能不會(huì)記得老同學(xué)了。
3.Will you have known Kevin for 10 years next month?
到下個(gè)月你認(rèn)識(shí)凱文該有10年了吧？
4.Pick me up at 8 o'clock,I will have had breakfast by then.
早上8點(diǎn)鐘你來(lái)接我，到時(shí)我已經(jīng)吃完早飯了。
5.We will have learned 12 units by the end of this term.
到這個(gè)學(xué)期末，我們將學(xué)完12個(gè)單元。
6.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。
7.You will have heard of this, I guess.
屆時(shí)我想你已經(jīng)聽(tīng)說(shuō)過(guò)這件事了。
8.I am sure he will have got the information.
我相信他一定會(huì)得到這個(gè)信息。
9.We will have been married a year on June 25th.
到6月25日我們倆結(jié)婚就滿1年了。
10.They will have been married for 20 years by then.
到那時(shí)他們倆結(jié)婚就滿20年了。