过去进行时表示的概念

1 在过去某个特定的时间正在进行或发生的动作。

2 当过去的一个动作发生的时候另外一个动作正在进行。

结构：

主语+ was（were）+ doing

I was sleeping at eight o'clock yesterday morning.

They were swimming in the river at three o'clock yesterday afternoon.

at this time 这个时候

I was walking in the street at this time last week.

I was leaving the house when he arrived.

when 当……的时候

while 当……的时候（强调两个动作的同时进行）

just as 正当……

I cut myself while I was shaving.

I cut myself badly while I was shaving.

过去完成时：过去某个特定的时间之前动作已经完成。过去两个动作的比较，发生在前面的是过去完成时，后面的是一般过去时。

结构：

主语 + had + 动词的过去分词

I had read five books by the end of last year.

term

learnt

The students had learnt two thousand words by the end of last term.

before, after

Mr.Smith bought a new car after he had sold his old car.

We had had dinner before they arrived.

When I was leaving the house he arrived.

When I was having breakfast, someone knocked at the door.

ring, rang

The telephone rang just as I was opening the door.

slip 滑倒

hurt 伤着

get off the bus 下公共汽车

When she was getting off the bus, she slipped and hurt herself.

My wife was cooking in the kitchen while I was working in the garden.

Lesson 118 What were you doing?

page 239

ask

sell sold sold

I asked the price of the car, but they had already sold it.

run, ran, run

leave, left, left

platform 站台

The day before yesterday, I ran to the platform quickly, but the train had already left.

go, went, gone

finish, finished

She had finished the housework before she went out.

go on holiday 度假

take the exam 考试

go, went, gone

take, took, taken

She went on the holiday after she had taken the exam.

Lesson 120 It had already happened.

page 243

correct 纠正

exercise 练习

Lesson 118 What were you doing?

page 239

Written exercises 书面练习 A

1 He knocked at the door when I was answering the phone.

2 He came downstairs when I was having breakfast.

3 The phone rang when I was washing the dishes.

4 The boss arrived when she was typing a letter.

5 The rain left when I was buying the tickets.

6 It rained heavily when I was driving to London.