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.

收银员：谢谢您，175块。

泰瑞：给你钱。

收银员：这是您的找零和发票。

（正当他离开时，红外线报警器响了。）

收银员：您身上带着什么还没付款的东西吗，先生？

泰瑞：不，我想没有。

收银员：对不起，我得叫保安来看看。

泰瑞：肯定是什么地方出错了。

收银员：对不起，先生，我的职责是保证商品的货款付清。

泰瑞：等一下，您能看看这副太阳镜吗？我在二楼买的。我想他们忘了给它消磁了。

收银员：好的。啊……问题就在这儿。您付款了吗？

泰瑞：当然了，这是发票。

收银员：让我看看……哦，真是太对不起了，先生。

泰瑞：没关系。

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.

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

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……