Casher: Thank you, 175 yuan.
Terry: Here you go.
Casher: Here is your change and your receipt.
(Just as he leaves, the infrared alarm burps.)
Casher: Do you have goods unpaid on you, sir?
Terry: No, I don't think so.
Casher: I'm sorry I need to call the security to have a look.
Terry: There must be a mistake.
Casher: Sorry, sir, it's my job to make sure the goods are paid.
Terry: Wait, can you check these sunglasses? I bought it in the second floor. I think they forgot to demagnetize it.
Casher: Sure. Ah…That's the problem. Have you paid for it?
Terry: Of course I did. Here is the receipt.
Casher: Let me see…Oh, I am awfully sorry sir.
Terry: That's all right.
Terry: Hello, I'm Terry, from Australia. I like traveling in China. The Nation's capital Beijing is a nice place. But one time I had a trouble with the cashier in a supermarket. It turned out to be a mistake but it reminded me that you could never be too careful.
生词小结
infrared n. 红外线
alarm n. 警报
burp vi. 响
unpaid adj. 未付款的
security n. 保安
mistake n. 错误
sunglass n. 太阳镜
demagnetize vt. 消磁
Functional structure 功能性句型扩展
表达义务和需求的句型
请朗读以下句型，家长和孩子交替进行。
1. 需要
I need…我需要……
I am in need of…我需要…
I want…我想要…
2. 不需要
You don't need to…你不需要……
There's no need to…没有必要……
It's not necessary. 这没必要。
That's not required. 这没有要求。
3. 义务
I am in charge of …我负责……
It's my duty to… ……是我的职责。
That's my responsibility. 这是我的责任。
I am responsible for… 我对…负责。
It's my obligation. 这是我的责任。
I should /shall/ must… 我必须……
I'm bound to …我必须……
