本篇文章给大家谈谈一课一题一语法：新概念英语第一册第125-126课，以及一课一题一语法：新概念英语第一册第125-126课对应的知识点，文章可能有点长，但是希望大家可以阅读完，增长自己的知识，最重要的是希望对各位有所帮助，可以解决了您的问题，不要忘了收藏本站喔。

[往期回顾]

一课一题一语法：新概念英语第一册第123-124课

以下是第123-124课的参考答案：

【回答】

1. That is our English teacher who plays football very well.

That is our English teacher playing football very well.

2. This is the book which has been translated into many foreign languages.

This is the book having been translated into many foreign languages.

3. Have you watched the game which was held in Shanghai yesterday?

Have you watched the game held in Shanghai yesterday?

4. The soldier who has saved ten children from the fire is only nineteen years old.

The soldier having saved ten children from the fire is only nineteen years old.

5. Do you know the man who is keen on extreme sports?

Do you know the man keen on extreme sports?

[本期内容]

本周我们继续分享《新概念英语1》第125-126课的重点句型或语法。让我们先读第一百二十五课的课文：

一.原文

第二，关键句型或语法

这节课是关于情态动词must，need和have to的用法。

(a) must be

本课中“必须”表“必须”的基本用法是：

sb. must do sth.

比如：

I must go there at once.

它的否定表达是：

sb. needn't/don't have to do sth.

比如：

I needn't/don't have to go there at once.

[注意]

The difference between unnecessary and not:

不必意味着“不必要”,千万不要意味着“禁止”;不能。”比如：

He needn't do it now.

他不必现在做这件事。

He mustn't do it now.

他现在做不到。

其疑问句的表达方式是：

must sb. do sth.

比如：

Must you go there at once?

What must you do at once?

(2) Need

Need用作情态动词，意为“需要；Must”，但一般用在否定句中，作为must的否定表达，其基本用法是：

sb. needn't do sth.

比如：

She needn't buy a house of her own.

[注意]

Need作为情态动词，一般不用在肯定句中，偶尔用在疑问句中，如：

Need she leave now?

当need也可以用作实义动词时，它的基本用法是：

sb. need sth.

sb. need to do sth.

比如：

She needs some help from us.

She does not need to get up early tomorrow.

Need也可以用作名词，如：

They are in great need of medicine.

(3) Have to

Have to其实不是情态动词，它只是表示“必须；不得不”，它的语法变形是根据实体动词的要求而改变的，它的基本用法是：

sb. have to do sth.

比如：

She has to buy more ink.

它的否定表达是：

sb. don't have to do sth.

比如：

She doesn't have to buy more ink.

其疑问句的表达方式是：

do/does sb. have to do sth.

比如：

Does she have to buy more ink?

What does she have to buy?

[注意]

Nothing to do and nothing to do can be used interchangeably.

第三，一课一问

根据这节课的重要语法点，让我们按照要求练习和改写下面的句子。

She must drink some water at once. (changed to negative sentence)

He needs to do his homework every day. (changed to negative sentence)

I have to lend him my notebook. (Ask questions about the underlined part)

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