过去完成时的用法

1) 概念：表示过去的过去

----|-------|-----|---->其构成是had +过去分词构成。

那时以前　那时　现在

2) 用法

a.　在told,said,knew,heard,thought等动词后的宾语从句。

She said (that) she had ever been to Paris.

她说她曾去过巴黎

b. 状语从句

在过去不同时间发生的两个动作中，发生在先，用过去完成时;发生在后，用一般过去时。

When the police arrived,the thieves had run away.

当警察赶到时，小偷已经跑了

c. 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.

那时我们希望你能来，但是你没有

3)　过去 完成时的时间状语before,by,until,when,after,once,as soon as。

He said that he had learned some English before.

他说他以前学过一些英语

By the time he was twelve,Edison had began to make a living by himself.

在他十二岁的时候，爱迪生就开始自己谋生了

Tom was disappointed that most of the guests had left when he arrived at the party.

汤姆失望了，大多数客人都当他到达晚会离开

典型例题

The students ___ busily when Miss Brown went to get a book she ___ in the office.

A. had written,left　B，were writing,has left　C. had written,had left　D. were writing,had left

答案D. "把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此

前一句应用过去进行时。

注意：　had no … when　还没等…… 就……

had no sooner… than　刚…… 就……

He had no sooner bought the car than he sold it.

一般过去时代替完成时

1)　两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。

When she saw the mouse，she screamed.

当她看到老鼠，她尖叫

My aunt gave me a hat and I lost it.

我的阿姨给了我一顶帽子，我把它弄丢了

2 ) 两个动作相继发生，可用一般过去时;如第一个动作需要若干时间完成，用过去完成时。

When I heard the news,I was very excited.

当我听到这个消息，我很兴奋

3)　叙述历史事实，可不用过去完成时，而只用一般过去时。

Our teacher told us that Columbus discovered America in 1492.

我们的老师告诉我们，哥伦布1492年发现美国