has kept

has been kept

过去完成时

had kept

had been kept

一般将来时

will keep

will be kept

虚拟语气

would keep

would be kept

3. 本单元出现的被动语态

Who was it / were they invented by?

它(它们)是由谁发明的?

It was / They were   invented by … + sb.

它(它们)是由……发明的。

When was it / were they invented by?

它(它们)是什么时候被发明出来的?

It was / They were   invented … + time

它(它们)是……被发明出来的。

What is it / are they  used for?

它(它们)有什么用途呢?

It is / They are    used for + doing sth.

它(它们)被用来……。

任务Ⅱ.   请用下列词汇编几组特殊疑问句。(用被动语态)

electric slippers, adjustable heels, tea, microwave ovens, potato chips

1.__________________________? (When)

2.__________________________? (When)

3.__________________________? (What)

4.__________________________? (Who)

5.__________________________? (Who)

任务Ⅲ.  请仿照sample，编三组对话介绍中国的四大发明吧!( Four Great Inventions )

Clues:

What:   paper making

Wh    Cai Lun

When:   one thousand eight hundred years ago

What…for: record information

A: What do you think is the most important invention?

B: That is paper making.

A: Who was it invented by?

B: It was invented by Cai Lun.

A: When was it invented?

B: It was invented one thousand eight hundred years ago.

A: What is it used for?

B: It is used for recording information.

下面的表格将帮助你完成编对话。

the names of inventions

when

who

be used for

gun powder

Tang Dynasty

don’t know

exploding, war, fireworks

compass

War Dynasty

Chinese people

knowing the direction

printing

one thousand ,three hundred years ago

Bi Sheng

printing

paper making

one thousand  eight hundred years ago

Cai Lun

recording information

任务Ⅳ.  阅读理解

Future computer

Do you forget to turn off the lights and heateas when you go out of a room? In 2004 it will not matter. They will turn themselves off and on again when your return. You will choose the temperature for each room the lighting and the humidity. (湿度) A sensor will detect ( 察觉) the presence of a human ( and, with luck, ignore ( 忽略 )  the dog!) and turn the systems on, and when the humans leave it will turn them off again.

The sensors will work through the central home computer, and they will do much more than just turn the fire and lights on and off for you. They will detect faulty electrical equipment, wires or switches, separate ( 隔离) them so that they can’t harm anyone, and then warn you that they need repair. They will detect fire and if you are out of the house, the computer will call the fireman. It will also call the police if the sensors detect a robber. This will not be too difficult because the locks on the outside doors will be electronic. You will open them using our personal card------ the one you use for shopping-----may be using a number known only to you.