新人教版英语九年级下册教案 Unit 13 We’re trying to save the earth(第2课时)教

Unit 13 We

’

re trying to save the

earth

教材分析

本单元带领学生了解了一些有关地球污染，动物濒危等

问题。并且教给大家如何保护濒危动物，如何通过回收利用

等方式来保 护地球。本单元主要复习语法内容为情态动词和

动词形式变化。本课主要带领大家进行语 法复习，巩固语法

知识。

一、

三维目标

(

一

)

知识与技能

1. To learn different forms of verb.

2. To understand the use of Modal Verbs.

(

二

)

过程和方法

3. To know how to use different forms of verb in

different situations.

4. To know how to use Modal Verbs in different

situations.

(

三

)

情感态度和价值观

5. After learning this part, every student will be

able to describe their awareness of the serious

situation

of

pullution

and

solutions

to

environmental problems using what we have learned

in this lesson.

教学重点

1.

To

change

forms of verb

according

to specific

situation.

2. To use Modal Verbs properly.

教学难点

1. To change forms of verb according to specific

situation.

2. To use Modal Verbs properly.

二、

教学策略

根据本课教学目标和重点内容，

教师可采用读，

小组讨论，< /p>

口头及书面练习等活动来引导学生进行学习。

三、

教学准备

ppt

，

recorder

，

mutiple-media

四、

教学环节

1

、

课堂导入

Step 1 Lead-in

判断下列句子中使用了什么时态及情态动词。

1. We are trying to save the earth.

2. The river used to be so clean.

3. It was considered the nicest river in the town.

4. The air has become really polluted.

5. We should help savew the sharks.

Answers: 1.

现在进行时

2. used to 3.

一般过去时的被

动语态

4.

现在完成时

5. should

2

、

课堂讲授

Step 2. Presentation

1) Review different forms of verb

ask

主动语

态

一

般

被动语

态

主动语

进

态

行

被动语

态

主动语

完

态

成

被动语

态

现在时

过去时

将来时

shall/will

ask

过去将来时

should/

would

ask

ask / asks

asked

am/is/are

was/were

shall/will

should/would

asked

asked

be asked

be asked

am/is/are

was/were

asking

have/has

asked

have/has

asking

had asked

had been

been asked

asked

2) Review Modal verbs.

Main function of Modal Verbs.

①

.

can

(could)

表示能力，

coul d

主要指过去时间；表示

允许。

②

.

ma y

表允许，

might

可以指过去时间 ，

也可指现在时间，

语气更委婉。

③

. must

表示义务。意为“必须”（主观意志）

④

. shall

表征询意见

⑤

. will

表意愿，用于各种人称 陈述句；表请求，用于疑

问句。

⑥

. should / ought to

应该

3

、

课堂练习

Step 3 Exercises

1) Fill in blanks with the correct forms of verbs.

Interviewer: ___________ you ever ________ (take )

part in an environmental project?

Ken: Yes, I have. I ___________ (help ) with a

Clean-Up Day last year. It was _________

(consider)

the

biggest

clean-up

project

this

city

__________

ever

___________

(have).

Interviewer:

How

many

people

__________

(take

)

part?