3．过去完成时与一般过去时的比较
一般过去时表示过去时间的动作或状态。过去完成时表示的动作或状态发生在一般过去时表示的动作或状态之前，因此它表示的是“比过去更过去”。
I
returned the book that I had borrowed.
我已归还了我借的书。
He
didn't know a thing about the verb, for he had not studied his lessons.
他对动词一无所知，因为他没有好好学习功课。
I had
been at the bus stop for 20 minutes when a bus finally came.
我在车站等了20分钟车才来。
C．将来完成时
1．将来完成时的构成
将来完成时的构成是由“shall/ will + have +过去分词”构成的。
Before
long he will have forgotten all about the matter.
不久他就会全然忘记这件事的。
He is
somebody now. He will not have remembered his old classmates.
他现在是一个有身份的人了，他可能不会记得老同学了。
Will you
have known Kevin for 10 years next month?到下个月你认识凯文该有10年了吧？
2.将来完成时的用法
①表示在将来某一时间之前已完成的动作，并往往对将来某一时间产生影响。
We shall
have learned 12 units by the end of this term.
到这个学期末，我们将学完12个单元。
By the
time you get home I will have cleaned the house from top to bottom.
你到家之前我将把房子彻底打扫一遍。
Will you
soon have finished laying the table?
你会很快摆放好餐桌吗？
注意：
在时间状语从句中，不用将来完成时，要用现在完成时来代替。
When I
have finished that, I shall have done all I am supposed to do.
等我做完这件事时，我就做完我该做的所有的事了。
Please
don't get off the bus until it has stopped.
请待车停稳了再下车。
②表示推测
You will
have heard of this, I guess.
我想你已经听说过这件事了。
I am
sure he will have got the information.
我相信他一定得到了这个信息。
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