标题：过去完成时过去完成时的基本概念和形式

内容：
过去完成时(past perfect tense)表示在过去某一时间或动作以前已经完成了的动作。

简言之，过去完成时所表示的时间就是过去的过去。

过去完成时由助动词had + 过去分词构成。

过去完成时的用法1)过去完成时表示在过去某一时间或动作以前业已完成的动作。

这个过去的时间可以用by，before等介词短语或一个时间状语从句来表示。

如：By the end of last week we had learned ten lessons.

到上周末为止，我们已经学了十课书。

He had learned some English before he came to the institute.

他来学院之前学过一些英语。

I didn't go to the film because I had seen it twice.

我没去看电影，因为这片子我已看过两次了。

When I had gone over my lessons I took a rest.

我复习完功课之后，休息了一会儿。

I gave my little sister the flowers that I had bought for her.

我把给妹妹买的花送给她。

In the exhibition he saw many oil paintings that he had never seen before.

他在展览厅里见到许多过去从未见过的油画。

2)过去完成时可以表示由过去某一时间开始，一直延续到过去另一时间的动作，常和for(有时可以省去)或since构成的短语或since引导的从句连用。

如：It rained yesterday after it had been dry for many months.

在天旱了好几个月之后，昨天下雨了。

By the I read his new book， I had known him for a long time.

到我读他的新书时，我早就知道他了。

He said that great Changes had taken place in his hometown since，1980.

他说7980年以来他的家乡大变样了。

[注]当一个由when，before，after，as soon as等连词引导的从句所表示的动作和主句的动作紧接时，两个动作均可用一般过去时来表示。

如：We had breakfast after we did morning exercises.

做完早操后，我们吃早饭。

When I finished supper，I took a walk.

我晚饭后就去散步。

The train started to move just before he reached the platform.

他到月台时火车刚开走。

They started ploughing as soon as they got to the fields.

他们一到地里就开始耕地。

发布时间：2025-06-09 15:02:23
来源：学历学位网
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