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学会在练习中提升知识和能力

2012-04-29袁祥波刘小红

都市家教·上半月 2012年6期
关键词:否定句情态语气

袁祥波 刘小红

教学设计:

教学课题:

情态动词can、could和be able to 的用法

教学目标:

知识目标:

1.复习并掌握can和be able to表能力的基本用法。

2.复习并掌握can和be able to表允许的基本用法。

3.复习并掌握can表推测的基本用法。

能力目标:

1.学会通过进行练习而分析句型和单词用法的能力。

2.学会通过分析问题而进行归纳总结的能力。

情感目标:

通过情态动词的复习,知道在英语中表情感除了运用感叹句、祈使句等句式和语气外,还可用情态动词表情感,这这种用法更直接、更清楚、更准确。

教学重点与难点:

重点:can、could、be able to的基本用法

难点:can和be able to的区别

【教学设备】多媒体

【教学课型】复习课

【教学课时】1课时

【教学方法】

1.先教后学,当堂训练。

2.启发式教学

教学过程:

STEP1.预习导航

Ⅰ、用can和be able to 的正确形式填空

1. He drive but he doesnt have a car.

2. China send people into space before. But now we can. (2010年衡阳中考题)

3. I used to stand on my head but I cant do it now.

4. Peter is a musician. He plays the violin and healso play the piano.

5. I cant see you on Friday but Imeet you on Saturday morning.

Ⅱ、选择最佳答案:

1. Ask Tom about your problem. He might help you .

A. be able to B. can C. could

2. Mikes car broke down but luckily he ____repair it .

A. can B . could C. was able to

3. She didnt know where she _____find wild roses.

A. may B. could C. can

4.you pass me a pen? Id like to write down the telephone number.

A. Need B. Could C. must

5.——Could I borrow your dictionary?

——Yes, of course you _____.

A. might B. will C. can

Ⅲ、你能写出我们初中阶段学过的表能力、许可和表否定猜测的情态动词吗?

1. cancantcannot

2. couldcouldnt

3. be able to

Ⅳ、写出你的困惑

1. can 和 be able to 的区分。

2. cant 和 cannot 可以通用吗?

3. can的否定式是 can not 吗?

4. 用be able to 的情况。

自我评价:( )()( )

STEP2.知识展现

1. can 和be able to 用于表示 能力 ,指有能力做某事,意为“能够”。如:

He can speak German.

Can you finish the homework tonight?

We are able to overcome the difficulty.

Fish cannot live without water.

Will you be able to come tomorrow?

2. can 用于表示 请求 或 许可 ,意为“可否”“可以”。如:

Can you wait for me for a minute, please?

You cant step on the grass.

Perhaps I can help you.

3. could 的用法。

1)用于表示过去能够。如:

When she was five, she could play the piano, she couldnt play the violin at all.

2)用于疑问句表示请求,语气较委婉,答语应该用 can 不能用 could。如:

—— Could I use your mobile phone?—— Yes, you can.

3)在宾语从句中表委婉语气的。如:

I wonder if I could come to your birthday party.

4)用于肯定句描述现在的情况,常用于委婉地陈述看法。如:

—— What shall we do this evening?

—— We could go to the cinema.

4.can 用于表示可能性(possibility)。

用于描述某事是否有可能发生,有惊讶、怀疑、不相信的语气,常用在否定句、疑问句或感叹句中,意为“可能,会”。 如:

Can this be true?

This cannot be done by her.

5.cant be 或“cant +动原” 用于否定句中,表推测某人或某事 不可能 出现或发生,意为“不可能……”。如:

—— Is the woman in white our manager?

—— It cant be her. She has just left for Shanghai.

你学懂了吗?

自我评价:( )()()

STEP3.巩固与提高

1.根据句子意思需要,用can 、 be able to的正确形式完成句子。

1)——May I take this book out of the reading room?

—— No, you, please read it here.

2)Many of the starsbe seen because they are far away from us.

3)Manlive without air.

4)Ill see you after the lesson.

5)—— Ann, you say this word in Chinese?

——Yes, its easy.

6)He(不能) to sleep well for 10 years.

7)He solve that problem without any help in the past.

8)Mikes car broke down. But luckily he repair it.

9)——I wonder if you could lend me some money.

—— Yes, I . No, I m afraid not.

10)—— Is that woman Toms mother?

—— No, it . His mother is much taller.

自我评价:( )( )( )

STEP4.合作探究

1. can和be able to的联系与区别:

相同点:表能力“能够”,一般情况下可以互换。如:

I can am able to say some English.

区别点:

1)can偏向于有生俱来的能力,而be able to 表示后天培养的能力,特别是通过 努力 要达到某种能力。如:Columbus was able to discover the new land after several years hard work.

2)can只有原形和过去式两种时态,be able to 还有将来时和完成时等多种时态。即can表将来时,可用be able to代替,完成时可用have been able to代替。

3)用在过去时中,could经常表示能够做某事,事实上不一定去做,而waswere able to 则表示“过去做成了某事”。在否定句中两者可通用。如:He could swim across the English Channel. But he didnt feel like it that day.

Yesterday I was able to get home before the heave rain.

2.千万注意没有can able to 这种形式。

3. can的否定式是cant 或cannot. 不要写成can not.

4. cannot和cant 有时可以互换。但表语气坚决时只能用cant.。例如表否定猜测说“不可能”只能用cant。

自我评价:( )()()

STEP 5.课堂小结

本课我的收获:

我的疑难:

STEP6.作业布置(略)

教学反思:

面对教育改革和《英语课程标准》的实施,教师首先要转变观念,改进教学法,正确处理教材。课堂教学要建立互动的新型的师生关系,充分发挥学生的主体作用,提高课堂四十五分钟的效益。

这堂课是在学生掌握了情态动词的基本特征:有一定的含义但不完整以及接动原才能作谓语、无人称和数的变化的基础上,进一步复习初中阶段最基本的情态动词can和be able to 的知识和用法。这节课教学目标明确,重点和要点突出,难点突破。在整个教学过程中设计了多个练习环节,所有的知识点都是在学生完成练习的基础上所生成的。由练习的操练达到知识点的归纳总结,达到知识上升到能力的水平。设计的任务环环相扣,层层深入,促进了师生间、生生间充分的交流与合作。

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