英语不止做为一门语言和交流工具，而是被提升到了必备技能的范畴，精品小编准备了高二英语必修4教案，希望你喜欢。

Teaching Aims:

1、 Learn that modal verbs can be used to talk about ability, obligation, certainty or permission, to make requests, suggestions, offers and to give advice.

2、 Enable students to learn that some modal verbs can be used with the continuous form and the perfect form to talk about current affairs or past actions.

Teaching Important Points:

1、 Develop the students' ability of using modal verbs.

2、 How to make students master the usage of modal verbs.

Teaching Difficult Points:

Develop the students' ability of using modal verbs and how to make students master the usage of modal verbs.

Teaching Methods:

Explanation and exercise

Teaching Aids:

1. The multimedia

2. The blackboard

Teaching Procedures:

Step1 Warming up

Say some sentences to warm up students: Can you drive ? He can jump 2 meters.

You must work hard ,or you have to live a hard life.

Step2 Lead in

Let students say sentences including modal verbs as many as possible.

Step3 Activities: (1)Introduce modal verbs with the following: Now, many of us can speak English quite well, but a few years ago, we couldn't. If we talk about the ability someone has now , we use "can". If we talk about the ability someone had in the past, we usually use "could".

Ask students: If we talk about the ability in the future, what modal verbs do we use ?

( will, shall, be able to )

(2) Ask students to make sentences using these words to talk about ability.

Show the usage of the modal verbs on the screen.

(3) Talk about obligation of the modal verbs "should, ought to, have to, must ",

Show the usage of the modal verbs on the screen.

Step4 Write the following sentence on the blackboard :

I might/may/could/should/ought to/will/must watch the TV programme tonight.

Explain the usage of these modal verbs, showing more examples on the screen.

Step5 Explain the usage of permission of the modal verbs "Can, could, might"

Show the examples on the screen

Step6. Ask students to read Part 1 on page 28 to find out how modal verbs are used to talk about ability, obligation, certainty and permission, showing more examples to the students and explaining the usage to the students.

Step7 Ask students to read Part 2 about the modal verbs of making requests, suggestions or offers, and give advice.

Step8 Ask students to read the instructions for the exercise on page 29, complete the article individually, and then check the answers in class. Ask students to give reasons for each choice they make.

Step 9 Ask students to read Part 4 on Page 28. Make sure that they understand why the continuous form or the perfect form is used in the example sentences.

Homework: Part C1 on page 100 of the workbook

Reference for teaching

情态动词

语法特征:

1) 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。

2) 情态动词除ought 和have 外，后面只能接不带to 的不定式。

3) 情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。

4) 情态动词没有非谓语形式，即没有不定式，分词等形式。

1. 比较can 和be able to

1)can/could 表示能力;可能 (过去时用could),

只用于现在式和过去式(could)。be able to可以用于各种时态,例如：will/shall be able to, would be able to, have/has/had been able to, must/may/might be able to。例如：

They will be able to tell you the news soon. 他很快就能告诉你消息了。

Now, many of us can speak English quite well, but a few years ago, we couldn't.

When my grandfather was young, he could swim across the river.

注意：could有时不表示时态

1)提出委婉的请求，主要用于疑问句，答语应用can(注意在回答中不可用could)。例如：

--- Could I have the television on? 我能看电视吗?

--- Yes, you can. / No, you can't. 可以/不可以。

2)在否定句、疑问句中表示推测或怀疑。例如：

He couldn't be a bad man. 他不大可能是坏人。

2)只用be able to的情况：

a. 位于助动词后。

b. 情态动词后。

c. 表示过去某时刻动作时。

d. 用于句首表示条件。

e. 表示成功地做了某事时，用was/were able to，表示在过去某时的某一场合设法做成了某事，=managed to do,而could则无此意义，不能用could。例如：

1.The fire was very big, but most people were able to escape from it.

2. He was able to flee Europe before the war broke out.

= He managed to flee Europe before the war broke out.

他在战争爆发之前逃离欧洲。

1.A:Do you know when Mr Hawking will be able to visit the school?

B: He said he might be able to come next month, but he's not sure.

2. I have been trying to get online for quite a long time, but I haven't been able to access the Internet on the new computer.

3. He has lived in Russia for three years. So he must be able to understand some Russian.

4. As a secretary, it is important to be able to type quickly.

5. You can get to the stadium either by bus or by underground.

6. The woman couldn't fall asleep as it was 12 p.m. and her son still

wasn't home.

2. 比较may和might

1)表示允许或请求;否定回答是，一般要用mustn't,表示"禁止""阻止"

---May I watch TV?

---Yes, you may./ No, you mustn't.

2)表示没有把握的推测,可能性的推测，含有"或许""可能""大概"的意思，用might代替may时，则语气显得更加不肯定(不用与疑问句)

He might be at home. 他可能在家。

It may be true.

He might have some fever.

She may come tomorrow.

注意：might 表示推测时，不表示时态，只是可能性比may 小。

典型例题

Peter ___come with us tonight, but he isn't very sure yet.

A. must　　B. may　 C. can　 D. will

答案B. 表可能性只能用may。此句意可从后半句推出。

3)may 放在句首，表示祝愿。例如：

May God bless you! 愿上帝保佑你!

May you succeed! May God be with you!

4)表示请示、允许时,might比may的语气更委婉，用May I...征询对方许可在文体上比较正式，在口气上比较客气，在日常口语中，用Can I...征询对方意见更为常见。

--- Might I use your telephone?

--- Yes, please.

--- May/Can I go home now? --- Yes, you may/can.

比较have to和must

1)两词都是'必须'的意思，have to 表示客观的需要，must 表示说话人主观上的看法，即主观上的必要。例如：

1. My brother was very ill, so I had to call the doctor in the middle of the night.　弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事)

2.He said that they must work hard. 他说他们必须努力工作。(主观上要做这件事)

3. The film is not interesting. I really must go now.

4. I have to go now, because my mother is in hospital.

2)have to有人称、数、时态的变化，而must只有一种形式。但must 可用于间接引语中表示过去的必要或义务。例如：

He had to look after his sister yesterday. 他昨晚只得照顾他姐姐。

3)否定结构中：don't have to表示"不必"，mustn't表示"禁止"。例如：

1.You don't have to tell him about it.　你不一定要把此事告诉他。

2.You mustn't tell him about it.　　　　你不得把这件事告诉他。

4)must

A. 表示"必须""应该"，语气比should, ought to强烈。其否定形式mustn't表示"不准""不应该""禁止"等意。mustn't "不准，不许"　语气强烈, needn't "不需要，没必要"　语气缓和

You mustn't miss this football match. It's very important.

You needn't watch the game if you don't want to.

B. 在回答带有must的问句时,否定回答常用needn't或don't have to,表示不必"

---Must I come back before 10? ---Yes, you must./No, you needn't/ don't have to.

C. must表示有把握的推测,一定,准是,想必,只用于肯定句中

It must be your headmaster.

There must be a hole in the wall.