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.

收銀員：謝謝您，175塊。

泰瑞：給你錢。

收銀員：這是您的找零和發票。

（正當他離開時，紅外線報警器響了。）

收銀員：您身上帶著什么還沒付款的東西嗎，先生？

泰瑞：不，我想沒有。

收銀員：對不起，我得叫保安來看看。

泰瑞：肯定是什么地方出錯了。

收銀員：對不起，先生，我的職責是保證商品的貨款付清。

泰瑞：等一下，您能看看這副太陽鏡嗎？我在二樓買的。我想他們忘了給它消磁了。

收銀員：好的。啊……問題就在這兒。您付款了嗎？

泰瑞：當然了，這是發票。

收銀員：讓我看看……哦，真是太對不起了，先生。

泰瑞：沒關系。

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. 紅外線

alarm n. 警報

burp vi. 響

unpaid adj. 未付款的

security n. 保安

mistake n. 錯誤

sunglass n. 太陽鏡

demagnetize vt. 消磁

表達義務和需求的句型

請朗讀以下句型，家長和孩子交替進行。

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…沒有必要……

It's not necessary. 這沒必要。

That's not required. 這沒有要求。

3. 義務

I am in charge of …我負責……

It's my duty to… ……是我的職責。

That's my responsibility. 這是我的責任。

I am responsible for… 我對…負責。

It's my obligation. 這是我的責任。

I should /shall/ must… 我必須……

I'm bound to …我必須……