英文原文：

Hi guys, this is Kee from BBC Learning English. Today I'm going to tell you the differences between 'mustn't' and 'don't have to'.

Now 'must' and 'have to' are similar in meaning – they are both used to describe obligations. However, their negative forms are completely different in meaning.

We still use 'mustn't' to talk about obligations. For example:
'In the house, I mustn't wear shoes' – you know, to keep the house clean.

But don't have to does not describe obligations, so the choice is yours. For example, if your teacher said 'you don't have to do your homework', well then the choice is yours. You can say 'alright, I won't'.

中文翻譯：

大家好，我是來自BBC Learning English的Kee。今天我將告訴您“mustn't”和“don't have to”的區(qū)別。

現(xiàn)在，“must”和“have to”的意思相似-它們都用于描述義務(wù)。然而，它們的否定形式在意義上完全不同。

我們?nèi)匀皇褂谩癿ustn't”來談?wù)摿x務(wù)。例如：“在房子里，我不能穿鞋”-你知道，為了保持房子的清潔。

但是，“don't have to”并不描述義務(wù)，所以選擇權(quán)在你手中。例如，如果你的老師說“你不必做你的家庭作業(yè)”，那么選擇就在你手中了。你可以說“好的，我不做”。

測(cè)驗(yàn)：

1.?You ____?recycle your waste, but it will be good for the environment.

A.don't have to?

B.mustn't

2. When visiting art galleries, you____touch the paintings on display.

A.don't have to?

B.mustn't

3. You____wear a costume at the Halloween party.

A.don't have to?

B.mustn't

4. You___?copy other students' homework – it's not right!

A.don't have to?

B.mustn't

答案：
1A

2B

3A

4B