C.比较：have to也表示“必须”，但have to更强调客观需要，must着重说明主观看法。如：

We had to be there at 10 o’clock.我们得在10点到那儿。(客观需要)

We must be back before 10 o’clock.我们必须10点前回来。(主观认为)

有时也可互换：

We must / have to leave now.我们得走了。

must和have to的否定式即mustn’t和don’t have to意思完全不同。Mustn’t表示“不作某事”，有禁止的含义;don’t have to表示“不必要(作某事)”，含有“客观上无此必要”的意思。例如：

You mustn’t move someone if the person is badly hurt.如果这人受了重伤，你一定不要动他.

2)need need作及物动词，和不定式连用：

need to do sth. 需要干某事

need也可做情态动词，主要用于否定句，即：

needn’t + v.不必干某事 例如：

You need to tell him the reason.你需要告诉他原因。

You needn’t tell him the reason. 你不必告诉他原因。

情态动词need也可用于疑问句，肯定回答对一般must，否定回答时用needn’t.

——Need I come? ——Yes，you must./No，you needn’t.

教学设计方案Lesson 29

Teaching Aims

1. Practise the dialogue.

2. Study the uses of same of the modal verbs.

3. Study the language points in the lesson.

4. Do the discussion practice in Part 2.

Step Ⅰ Revision and Warm Up

1) Revise ailments and parts of the body. the following; 　toothache, earache, headache, and stomachache. Say to the class:

I’ve got…and get them to complete the sentence. Point to parts of your body and say I’ve hurt my ( arm/foot/leg/back/hand).

2)You can ask the Ss for advice for all these ailments: ask what　should I do? and encourage the class to make suggestions.

Step ⅡPresentation

Tell the Ss a story by saying that this morning when I was on my way to school, I saw an accident in the street. A man was knocked down by a bike. He was injured on his knees. (Teach the new words injure and knee here. ) Some people went to help and he was sent to the hospital soon. I think he will be all right soon.

Say to the Ss Today we’re going to read a dialogue and learn about another accident in the street.

Step Ⅲ Listening

1.T: Say to the Ss that Chen Wei and Susan are walking down the street when they see an accident. Let’s listen to the dialogue. After listening, you are going to answer two questions.

1). What was the accident?

2). What did the girl injure?

Get two Ss to answer the questions. Check the answers.

1). A child ran into the street and knocked a girl off her bicycle.2). Her knee hurts, her knees and her head hurt too.

2.Play the tape again. This time the Ss can open their books while listening.

Step Ⅳ Reading

1.Give the Ss a few more minutes to read the dialogue carefully. Then give them a few questions

1).Why does Susan not agree to carry the girl to the side of the road?

2) Who do you think will come in a moment? Why?

3) What was the girl going to do?

Answers:1)Probably Susan has learned something about first aid. People mustn’t move someone if they are badly hurt. They should leave the person where he or she is.

2) Some doctors and nurses will come. Because Chen Wei has just called the First Aida Centre.

3) The girl was going go cook supper for her grandmother.

2. Do Ex. 1 in the Workbook, answering the questions to the dialogue.

Step Ⅴ Practice

1. Put the following sentences on the Bb. Get them to pay more attention when they are practising the dialogue.

We must carry her to the side of the road.

You shouldn’t move someone if they are badly hurt.

You should/ shouldn’t…

I ought to go home.

I have to cook supper for my grandmother.

2. Get the Ss to practise the first half of the dialogue, encourage some pairs to do it in class. Then get them to do group work, practising the second half of the dialogue, ask some groups to do it in front of the class.

Step Ⅵ Discussion

1. Part 2. Read the instructions aloud and check that the Ss know what they have to do. To make the discussion easy going, get the Ss to make notes in two columns as follows:

DOS 　　　　　　　　　　　　　　　　　DONTS

leave the person where he/she　is　 carry the person

telephone for help 　　　　　　　　　move the person

stay with the person 　　　　　　　　let the person get up

tell the person not to worry

tell the person to stay still

Demonstrate a short dialogue with a good student. You can also ask questions: Should I move the person? Should I give the person anything to drink? (No.) Put the Ss in pairs and get them to have similar dialogues. If you wish, you can get one or two pairs to act out their conversations in front of the class.

2. Do Ex. 2, Picture 2 in the Workbook. Look at the picture very carefully and ask the Ss to discuss in pairs or groups. Then gel one student in each group to report their ideas to the whole class. Discuss with the whole class and see if they are right and if they can add something new.

Answers:

You must send the woman to the hospital immediately. Don’t argue with the driver. If she loses one third of her blood, she may die.

Step Ⅶ Summary

1. After learning the dialogue, we know something about the first aid and how to deal with some accidents when we meet them. In this unit and in the next period we will learn more about first aid.

2. Go through the language points in the dialogue.

1) Chen Wei and Susan are walking down the street when they see an accident.

2) That girl has fallen off her bicycle. A child ran into the street and knocked her off her bicycle.

3) I think she must be injured.

4) Leave her where she is.

5) You mustn’t move someone if they are badly hurt.

6) Take it easy.

7) I ought to go home.

Step Ⅷ Homework

1. Do Ex. 2, Picture in the Workbook as written work.

2. Do Ex. 4.

教学设计方案Lesson 30

Teaching aims

1. Learn about some more about first aid.

2. Finish reading two passages in Lesson 30.

3. Study the language points of Lesson 30.

4. Practise using the patterns: You must…/ You mustn’t …/ You should always…/ You should never…

5. Finish off the exercises in Workbook Lesson 30.

Teaching procedures

Step 1 Revision

1. Check the homework exercises. Ask the Ss to describe the pictures in Wb Lesson 29, Ex. 2.

2. Revise the dialogue in Lesson 29.

3. Check Ss’ understanding of the four words in SB Page 44, Part 1.

Step 2 Presentation

1.Show the Ss pictures at the head of the text and discuss the pictures. Say the man’s head was badly injured and is bleeding. The woman is trying to help him to stop the bleeding.

1)What can you do when you meet with such accidents?

2)Can you do some of the first aid to people?

2.Then tell the Ss Today we are going to read about first aid. What is first aid? It is the medical help which you give to somebody immediately after an accident. You do not have to be a doctor to give somebody first aid. But you have to know what to do.

Teaching procedures

Step 3 Reading

1. Give the Ss a few minutes to do the fast reading of the text. Ask one student to repeat the definition of first aid.

2. Give them a few more minutes to do further reading. Then do Ex. 1 in Wb Lesson 30. Answer the questions one by one and make sure that the SB can answer them correctly.

3. Put up two tables on the Bb, showing the notes of the three important things to do and the three pieces of advice on dealing with common injuries.

Number	Three Important Things To Do
1	Check that the person can breathe.
2	Try to start the breathing.
3	Try to stop the bleeding at once.

Common injuries	Advice
Animal bites	Wash the wound under cold running water. See a doctor as soon as possible.
Burns	Cool the area of skin at once. Put dry clean cloth over the area of the burn. See a doctor.
Cuts	Wash the area of the cut, dry it and cover it with dry clean cloth.