标题：过去完成时
基本信息
定义过去完成时(past perfect tense)：强调的是过去某一动作或状态发生在另一动作前或过去某个时间，或指在过去某个时间段已经发生的事情，它就是过去的过去。
①表示发生在过去的动作对现 在造成的某种影响或结果，用来指定在另一个过去行动之前就已经完成了的一个事件。
②过去某动作一直持续到现 在将来可能还要延续下去。句中的动作发生在过去之前（过去的过去），即过去完成时动作发生在过去的过去。 He said he had been to Beijing twice. 他说他已经去过北京两次。（因为“说”said就是过去式，而去北京的动作发生在说said 的过去，所以用过完而不用现完。
过去完成时常用的时间状语有：
1. by the end of last year. By the end of last term, we had learned 5000 new words.
2. By the time sb. +动词过去式如：The bus had already left by the time I got there.基本结构主语+had+过去分词vpp.(done)
①肯定句：主语+had+过去分词+其他.
②否定句：主语+had+not+过去分词+其他.
③一般疑问句：Had+主语+过去分词+其他?
肯定回答：Yes,主语+had
否定回答：No,主语+hadn't
④特殊疑问句：特殊疑问词或词组+一般疑问句（Had+主语+过去分词+其他）？
⑤被动语态：主语+had（hadn't)+been+过去分词+其他
基本用法
概述（1）表示在过去某一时刻或动作以前完成了的动作，也可以说过去的时间关于过去的动作。即“过去的过去”。可以用by, before等介词短语或一个时间状语从句(在复合句中，由时间连接词引导的状语从句叫做时间状语从句)来表示，也可以用一个表示过去的动作来表示，还可能通过上下文来表示。
e.g：By nine o’clock last night, we had got 200 pictures from the spaceship.
到昨晚9点钟，我们已经收到200 张飞船发来的图片。
（2）表示由过去的某一时刻开始，一直延续到过去另一时间的动作或状态，常和for, since构成的时间状语连用。
e.g：I had been at the bus stop for 20 minutes when a bus finally came.
当车来的时候，我在车站已经等了20分钟。
He said he had worked in that factory since 1949.
他说自从1949年以来他就在那家工厂工作。
（3）叙述过去发生的事情，在已叙述了过去发生的事情后，反过来追述或补述以前发生的动作时，常使用过去完成时。
e.g：Mr. Smith died yesterday. He had been a good friend of mine.
史密斯先生昨天去世了。他以前是我的好朋友。
I didn’t know a thing about the verbs, for I had not studied my lesson.
我对动词一无所知，因为我没有好好学习功课。
（4）在含有定语从句的主从复合句中，如果叙述的是过去的事，先发生的动作常用过去完成时。
e.g：I returned the book that I had borrowed.
我已归还了我借的书。
She found the key that she had lost.
她丢失的钥匙找到了。
（5）过去完成时常常用在told,said,knew,heard,thought等动词后的宾语从句（或间接引语）中，这时从句中的动作发生在主句表示的过去的动作之前。
e.g：He said that he had known her well.
他说他很熟悉她。
I thought I had sent the letter a week before.
我认为我一星期前就把信寄出去了。
（6）状语从句：在过去不同时间发生的两个动作中，发生在前，用过去完成时；发生在后，用一般过去时。
如when,before,after,as soon as,till/until引导的
e.g：When I woke up, it had already stopped raining.
我醒来时雨已停了。
She didn’t go to bed until she had finished her work.
她直到把工作做完之后才睡觉。
注意：如果两个动作紧接着发生，则常常不用过去完成时，特别是在包含before和after的复合句中，因为 这 时从句的动作和主句的动作发生的先后顺序已经非常明确，这时可以用一般过去时代替过去完成时。
e.g：After he arrived in England, Marx worked hard to improve his English.
马克思到达英格兰之后，努力提高他的英语水平。
（7）动词think, want, hope, mean, plan, intend等用过去完成时来表示过去未曾实现的想法，希望，打算或意图等。
e.g：They had wanted to help but could not get there in time.
他们本来打算去帮忙，但没有及时赶到那里。
We had hoped to be able to come and see you .
我们本来希望能来看看你。
（8）过去完成时还可用在hardly…when…, no sooner…than…, It was the first (second, etc)
time (that)…等固定句型中。
e.g：Hardly had he begun to speak when the audience interrupted him.
他刚开始演讲，听众就打断了他。
No sooner had he arrived than he went away again.
他刚到就又走了。
It was the third time that he had been out of work that year.
这是他那一年第三次失业了。
时间状语
before,when,after,by+,until, once,had no sooner……than，yet，already等。例句She said she had never been to Paris. 她说她从未去过巴黎。
When the police arrived,the thieves had run away. 警察到达时，小偷们早就跑了。
By the time he was twelve,Edison had begun to make a living by himself. 到了十二岁那年，爱迪生开始自己谋生。
By nine o’clock last night, we had gotten 200 pictures from the spaceship到昨晚九点钟时,,我们已经收到了200照片从宇宙飞船
I had been at the bus stop for 20 minutes when a bus finally came当公共汽车终于到了时，我在车站已经等了20分钟。
He said he had worked in that factory since 1949.他说他已经自1949年以来在那个工厂工作。
Mr. Smith died yesterday. He had been a good friend of mine史密斯先生昨天去世了。他是我的好朋友
I didn’t know a thing about the verbs, for I had not studied my lesson.我对动词一无所知,因为我没有好好学习功课。[1]
I returned the book that I had borrowed.我已归还了我借的书。
She found the key that she had lost.她找到了那把丢掉的钥匙。
He said that he had known her well.他说,他很了解她。
I thought I had sent the letter a week before我以为前一周我寄了那封信的。
After he arrived in England, Marx worked hard to improve his English.马克思到英国后,他努力提高他的英语水平。
When I woke up, it had already stopped raining.当我醒来时,雨已经停了。
We had hoped to be able to come and see you我们本来希望能来看你。
It was the third time that he had been out of work that year这是他那一年第三次被失业。
I had finished reading the novel by nine o'clock last night到昨晚9点钟，我已经读完这本小说。
语法判定
1. 由时间状语来判定一般说来，各种时态都有特定的时间状语。与过去完成时连用的时间状语有：
（ 1 ） by + 过去的时间点。如：
I had finished reading the novel by nine o'clock last night.
（ 2 ） by the end of + 过去的时间点。如：
We had learned over two thousand English words by the end of last term.
（ 3 ） before + 过去的时间点。如：
They had planted six hundred trees before last Wednesday.2. 由“过去的过去”来判定过去完成时表示“过去的过去”，是指过去某一动作之前已经发生或完成的动作，即动作有先后关系，动作在前的用过去完成时，在后的用一般过去时。这种用法常出现在：
（ 1 ）宾语从句中
当宾语从句的主句为一般过去时，且从句的动作先于主句的动作时，从句要用过去完成时。在told, said, knew, heard, thought等动词后的宾语从句。如：
She said that she had seen the film before.
（ 2 ）状语从句中
在时间、条件、原因、方式等状语从句中，主、从句的动作发生有先后关系，动作在前的，要用过去完成时，动作在后的要用一般过去时。如：
After he had finished his homework, he went to bed.
注意： before, after 引导的时间状语从句中，由于 before 和 after 本身已表达了动作的先后关系，若主、从句表示的动作紧密相连，则主、从句都用一般过去时。如：
After he closed the door, he left the classroom.
（3）表示意向的动词，如hope, wish, expect, think, intend, mean, suppose等，用过去完成时表示"原本…，未能…"
We had hoped that you would come, but you didn't.3. 根据上、下文来判定I met Wang Tao in the street yesterday. We hadn't seen each other since he went to Beijing.
语法区别
一、与现在完成时的区别现在完成时表示的动作发生在过去，以现 在的时间为基点，但侧重对现 在产生的结果或造成的影响，与现 在有关，其结构为“助动词have (has) + 过去分词”；过去完成时则是一个相对的时态，以过去时间为基点，它所表示的动作不仅发生在过去，更强调“过去的过去”，只有和过去某时或某动作相比较时，才用到它。
比较：I have learned 1000 English words so far.到目前为止我已经学会了 1000 个英语单词。
I had learned 1000 English words till then.到那时为止我已经学会了 1000 个英语单词。
— I'm sorry to keep you waiting. 对不起，让你久等了。
— Oh, not at all. I have been here only a few minutes.没什么，我只等了几分钟。（“等”的动作从过去某一时间点持续到现在）二、与一般过去时的区别虽然这两种时态都表示过去发生的动作或存在的状态，但在使用时应注意以下几点：　
1. 时间状语不同：过去完成时在时间上强调“过去的过去”；而一般过去时只强调过去某一特定的时间。
比较：They had arrived at the station by ten yesterday.
They arrived at the station at ten yesterday.
2. 在没有明确的过去时间状语作标志时，谓语动词动作发生的时间先后须依据上下文来判断：先发生的用过去完成时，后发生的则用一般过去时。
She was very happy. Her whole family were pleased with her, too. She had just won the first in the composition competition.
3. 当两个或两个以上接连发生的动作用 and 或 but 连接时，按时间顺序，只需用一般过去时来代替过去完成时；另外，在 before ， after ， as soon as 引导的从句中，由于这些连词本身已经表示出时间的先后，因此也可以用过去时来代替过去完成时。
He entered the room, turned on the light and read an evening paper.
过去完成时表示过去的过去，不单独使用，一般和一般过去式一起使用。