(五)写作：My school rules

要求：1、语句通顺，层次清晰

2、80词左右

范文：

My school rules

Hey, I’m Linda! There are too many school rules at our school. I think most of them are OK. I can keep them. For example, we can’t listen to music in the hallways. We can’t be late for school. But I don’t like some other rules. We have to eat in the dinning hall. We can’t play games in the classroom or in the hallways. We have to get to school by seven thirty. We can’t wear hats in the classroom. And we can’t go out on school nights. I can’t stand these.

Do you have any rules at your school? Can you tell me some?

[典型例题]

3. 周末他们必须做什么？

______________________________________________________

2. 今天我表兄不必去俱乐部。

__________________________________________________

1. 晚饭后海伦必须练习钢琴吗？

_________________________________________________

5. Let’s _______________(not play)in the rain.

B. have to的用法

用法：

(1)have to 与其他情态动词一样，后面跟动词原形。它的意思是“必须，不得不”，强调客观原因，含不情愿的感情色彩。

(2)have to 有人称、数和时态的变化。一般现在时中，主语为第三人称单数时，用has to,主语为其他人称或复数时，用have to；一般过去时中，均要用had to。如：

He has to go home to look after(照看)his mother because she is ill.

I had to do my homework at home last night.

(3)have to 的否定句和疑问句要借助do/does来构成。

否定句：主语+don’t / doesn’t have to+其他。

You don’t have to come every day.

一般疑问句：Do / Does+主语+have to+其他？

--- Do you have to go there now?

--- Yes, you do. / No, you don’t.

特殊疑问句：疑问句+do/ does+主语+have to+其他？

　 Where did they have to go yesterday?

[闯关]

4. Don’t _______________(be)sad! Your friends are coming.

3. Let me _____________(help)you with the housework.

2. _______________(not make)so much noise(噪音), please.

1. ______________(stop)talking and listen to her, please.

6. What else do you have to do?

(四)语法知识：祈使句和have to的用法

A. 祈使句

含义：表示说话人的请求、命令、建议、劝告或征求对方意见等。省略主语。表示请求、劝告时可在句首或句末加上please，使语气更客气。

肯定句：

(1)Do 型，即：实义动词原形+其他。如：Give it to Li Ming, please.

(2)Be 型，即：Be+表语+其他。如：Be friendly to him!

(3)Let 型，即：Let+宾语+动词原形。如：Let’s go to a movie.

否定句：

(1)Do 型在句首加don’t构成。即：Don’t+实义动词+其他。如：Don’t run across the street.

(2)Be 型也在句首加don’t构成。即：Don’t+be+表语+其他。如：Don’t be sad! Everything will be all right.

(3)Let 型否定句分两种： Don’t let+名词/代词宾格+动词原形+其他；

Let’s not+动词原形+其他。

　　 如：Don’t let children swim there.

　　 Let’s not watch TV. It’s boring.

[闯关]