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they will have been married for 20 years by then. you will have reached shanghai by this time tomorrow.

    將來完成時(shí)用來表示在將來某一時(shí)間以前已經(jīng)完成或一直持續(xù)的動(dòng)作。經(jīng)常與before+將來時(shí)間或by+將來時(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。

    構(gòu)成will/shall+have+完成式用于第一人稱，will+have+完成式用于其他人稱。

    實(shí)例

 
    a.狀態(tài)完成：表示某事繼續(xù)到將來某一時(shí)為止一直有的狀態(tài)。

    b.動(dòng)作完成：表示將來某一時(shí)或另一個(gè)將來的動(dòng)作之前，已經(jīng)完成的動(dòng)作或已獲得的經(jīng)驗(yàn)。

    they will have been married for 20 years by then. you will have reached shanghai by this time tomorrow.將來完成時(shí)的構(gòu)成將來完成時(shí)的構(gòu)成是由"shall/will + have +過去分詞"構(gòu)成的。

    before long he will have forgotten all about the matter. 不久他就會(huì)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(gè)有身份的人了，他可能不會(huì)記得老同學(xué)了。

    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？

    將來完成時(shí)的用法

    ①表示在將來某一時(shí)間之前已完成的動(dòng)作，并往往對(duì)將來某一時(shí)間產(chǎn)生影響。

    we shall 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。

    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(cè)，相當(dāng)于"must have done"結(jié)構(gòu)。

    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(gè)信息

    ③表示某種狀態(tài)一直持續(xù)到說話人所提及的時(shí)間

    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

    將來完成時(shí)用來表示在將來某一時(shí)間以前已經(jīng)完成或一直持續(xù)的動(dòng)作。經(jīng)常與before+將來時(shí)間或by+將來時(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。