最新-八年级英语下册 Chapter4《A dangerous servant

Chapter 4 A dangerous servant
I. Words and Expressions
1. explain v. 解释 explanation n. 解释
please give me an explanation of why you are always late for school. 对于你为什么总是迟到，请给我一个解释。

2. month n. 月 monthly adv. 每月一次地
we pay the telephone bill monthly. 我们每月付一次电话账单。

3. polite adj. 有礼貌的 politely adv. 有礼貌地
Tom offered me a cigarette. I refused politely. 汤姆给我一支烟，我礼貌地拒绝了。

4. invisible adj. 看不见的
air is invisible, but we can feel it when it moves. 空气是看不见的，但是当它移动的时候我们能感受到。

5. get sb sth （动词get后跟双宾语）买某物给某人
would you please get me a packet of crisps? 你能帮我买一包薯片吗？
6. Change…into…把……变成……
we can change electricity into different forms of energy such as light energy. 我们能把电变成各种形式的能量，比如光能。

7. connect…to…连接……到……
This thick wire is connected to my computer. 这根粗电线连接到我的电脑上。

II. Language Structure
1. 情态动词
1) can 能力、提出请求、请求允许
Can I have a look?
2) may 请求允许，可能
May I come around this afternoon?
3) must 义务、禁止，猜测
The smell must be good.
4) need a. 作情态动词后接动词原形，但多用于否定和疑问结构中。

You needn’t hurry. We still have enough time.
b. 作实义动词可接sth，也可接to加动词原形。

I really need your help.
You don’t need to hurry. We still have enough time.
2. 宾语从句
在特殊疑问句充当宾语从句时要将其改成陈述句的语序。

I don’t know where the teacher is.
III. Notes
能量的表达：heat energy(热能), movement energy (动能), light energy (光能), sound energy(声能)
其他：electrical energy (电能), potential energy (潜能，势能), chemical energy(化学能)，solar energy(太阳能)。