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1、新概念二 Lesson 17：must 与have to的辨析

新概念二 L17 ：must 与have to的辨析

must 是情态动词

表示：1. “必须”，用于一般疑问句时，否定回答用needn't或not have to;否定式是mustn't “禁止；绝对不能”。 例句：We must be careful when crossing the street.

Must I hand in my homework today? Yes, you must. No, you needn't/don't have to

It's no parking area. You mustn't park your car here. Or you will receive a ticket.

2. “一定是”，表示猜测，只用于陈述句的肯定句。否定句中表示“不可能是”，用can't。

例句：He must belong to the soccer club.

It must be Tony's bag. There is his name on it.

The man at the school gate can't be our headmaster. He is having a meeting in his office.

have to do sth. 也是一种特殊的情态动词。

表示“不得不；必须”。往往表示客观上的原因。有各种时态。

例句：We couldn't afford to take a taxi. So we had to walk home.

Now it's nearly 8 o'clock. You have to hurry up. Or you will miss the train.

The weather forecast says it will be rainy tomorrow. The children will have to stay indoors.

2、must的一般疑问句用法及回答：must的一般疑问句回答

1、在回答must开头的一般疑问句时，肯定回答用must，否定回答用needn't或don't have
to. 如：
1)―Must I finish my homework before eight o'clock? ―Yes, you must.
2)―Must I attend the meeting?
―No, you needn't(No, you don't have to). You can askTomto go instead.

2、在回答may开头的一般疑问句时，肯定回答用may，否定回答用mustn't. 如：
1)―May I watch TV after supper? ―Yes, you may. / No, you mustn't.
2)―May I stop here? ―No, you mustn't.

3、在回答need开头的一般疑问句时，肯定回答用must，否定回答用needn't. 如：
1)―Need we stay behind after school? ―Yes, you must.
2)―Need he go now? ―No, he needn't.

表达必须,一定的意思的一般现在时的句子中只能用must（需要注意的是：除了现在一般时,其他各种时态都要借用have to）

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