定義：將來完成時是用在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短語引導(dǎo)的現(xiàn)在時的從句連用。
結(jié)構(gòu)：“will have +過去分詞”。如：
將來完成時：He will have solved the problem.
將來完成時的被動語態(tài)：The problem will have been solved by him.
二、將來完成的用法
1. 表示“將來完成”
即表示到將來某個時間為止勢必會完成或預(yù)計要完成的動作。如：

When we get there, she’ll have gone to work.

我們到那里時她會已上班去了。

I expect you will have changed your mind by tomorrow.

我預(yù)料到明天你就會改變主意了。

2. 表示“持續(xù)”
即表示某種狀況將一直持續(xù)到說話人所提及的某一將來時間。如：
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。

By this time next week, I will have been working for this company for 24 years.

到下星期此刻，我就已經(jīng)為該公司干了24年了。

3. 表示“推測
即表示根據(jù)某情況作出的推測。如：
That will have been Roland. He said he’d be back at 7.

準(zhǔn)是羅蘭。他說他7點鐘回來。

There will have been a definite result before Friday.

星期五以前肯定會有結(jié)果。

三、將來完成通常搭配的狀語
1. 用作狀語的介詞短語
There will have been a definite result before Friday.

星期五以前將肯定會有結(jié)果。

By next Christmas we’ll have been here for eight years.

到下一個圣誕節(jié)，我們在這兒就住了整8年了
。
By now you will have guessed that I’m back in Ireland.

你現(xiàn)在應(yīng)該已經(jīng)猜出我回到了愛爾蘭了。

By the end of next week, I will have been a teacher for 25 years
.
到下周末，我當(dāng)老師就有25年了。

We’d better wait till 14 December. David will have had his exam by then, so he’ll be able to enjoy himself.

我們最好還是等到12月14日。到那時大衛(wèi)就考完試了，這樣他就能夠玩得痛快。

2. 用作狀語的從句
If I don’t run, the train will have left.

如果我不跑，火車就會開走了。

If he turns it down, he will have lost the moral high ground to the president.

如果他拒絕的話，就會把精神上的優(yōu)勢輸給總裁。

If you finish this job as well, you will have done far more than I expected.

假如你將這項工作干完的話，那你會干得比我預(yù)料的要多了。

If there was any scandal in that company, you can be sure that Bobby will have clocked it.

那家公司有任何丑聞，博比肯定會知道。