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Module 12 Unit 3 Language in use
【学习目标】
一、掌握情态动词 must, can, could 表推测。
二、掌握祈使句的用法。
【学习过程】
一、根据句意及首字母补全单词
1. K_________ money in a safe place.
2. We played basketball i_________ because it rained.
3. I'll hear a footstep on the s__________.
4. Earthquake is very c____________ in Japan.
5. Many earthquakes can cause a lot of d__________.
6. They c____________ people from the beach.
二、选用方框中的介词完成句子

1. People are trying to clear the rocks _____ the roads.
2. She learnt __________ underwater earthquake.
3. They cleared people ______ the beach just minutes before a huge wave reached the land.
4. I met my friend Tom _______ my way home.
5. Our parents are proud _______ us.
6. A ten-year-old girl saved about one hundred other tourists in 2004_________ warning them that a huge ocean wave was coming across the sea.
【课堂导学】
一、情态动词must, can, could 表示推测
情态动词can, could 表示“能够，可以”等意义,can, could 还表示对现在或将来的推测。意为“会，可能”。
1、can 表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比could 表示的“可能性”要大；用于否定句时，can’t 表示“不可能”。
例如：You can’t be serious! 你不是认真的吧！
2、could 则可用于肯定句、否定句和疑问句，表示某事有可能发生或可能是事实
例如: He could be in pain. 他可能很疼。
Can/Could this be true 这有可能是真的吗？
3、情态动词must 也可以表示猜测，意思为“一定、准是”，通常只能用于肯定句。
例如：Betty, you must know! 贝蒂，你肯定知道！
辨析：
（1）Who sent the present Can it be your brother 是谁送来的礼物啊？会是你哥哥吗？（询问可能性）
（2）It must be your brother. 肯定是你哥哥。（语气强烈，表示非常肯定）
（3）It can’t be my brother. His still in France. 不可能是我哥哥，他还在法国。（表示不肯能）
二、祈使句表达说话人对对方的叮嘱、劝告、希望、禁止、建议、请求或命令等。祈使句一般以动词原形开头，无时态和数的变化。常见的句型如下：
1、动词原形构成的祈使句
此类祈使句暗含的主语是you, 但通常省略。祈使句的句首或句末有时加please, 还可以加上称呼语，用逗号与句子主体隔开。例如：
Have a nice day! 祝你度过美好的一天！
Come this way, please. 请走这边。
Please be quiet, boys! 男孩们，请安静！
Make sure he’s warm. 确保他不受凉。
祈使句否定形式往往在句首加上do not (don’t ) 或never。例如：
Don’t use the lift. 不要使用电梯。
Never be late again! 再也不要迟到了！
2、 let’s 构成的祈使句
这类祈使句往往用于提出建议，例如：
Let’s spend this weekend in the countryside. 这周我们到乡下度周末吧。
祈使句否定形式是当祈使句表示邀请或建议(Let’s…) 时，则在Let’s与 do之间加not。
例如：Let’s not hurry. 我们不要太急。
3、无动词祈使句
在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使祈使句更简洁有力。
例如：Just a minute, please! 请稍等！
This way, please! 请走这边！
祈使句否定形式是句首加not。 例如：Not there! 不是那儿!
【课堂练习】
一、单项选择（语法专练）
( ) 1. --- Look at the boy running on the ground. Is it Davis
--- It ____ be him. I saw him go to the teacher’s office just now.
A. must B. can’t C. could D. might
( ) 2. Her doctor said, “________ work so hard”
A. Stop B. Don’t C. Can’t D. No
( ) 3. ________ in bed. It’s bad for your eyes.
A. Not to read B. Don’t read C. Don’t to read D. Not read
( ) 4. ________ when you cross the road.
A. Do care B. Care C. Be careful D. To be careful
( ) 5. ________ your child. We’ll look after him.
A. Not to worry about B. Don’t worry about
C. Not worry for D. Don’t worry with
( )6. —Do you believe what he says 　—Yes，it __________ be true.
A. can B. could C. need D. has to
( ) 7. The book on the teacher’s desk _____yours. Your name seems to be on it.
A. maybe B. must be C. may is D. has to be
( ) 8. Li Ying ____________ be here now as she went to Beijing three days ago.
A can’t B needn’t C mustn’t D may not
( ) 9. ---The lake is said to be dry. Is that true ---It ________.Look, some kids are swimming in it.
A. must be true. B. can’t be true C. may not be true D. can be true
( ) 10. ---David, is that man your head teacher
---It _____ be him. He’s the tallest in our school.
A. mustn’t B. can’t C. needn’t D. won’t
【课后练习】
一、用所给单词的适当形式填空
1. The earth can rise and fall beneath the building without ______________ (shake) it.
2. _________ (luck), my mum was at home.
3. People must stay inside to keep away from _______ (fall) rocks.
4. Do you keep them __________ (warmly).
5. Don’t move them to a ____________(comfortably) place。
二、根据要求完成句子
1. The government is warning people about an earthquake. (划线部分提问)
________ _________ the government _________
2. The children didn’t go to the playground because it rained. (同义句转换)
The children didn’t go to the playground _________ ________ rain.
3. There is something wrong with the radio. (改为否定句)
There _____ ____________ wrong with the radio.
4. She went to London by air yesterday. （划线部分提问）
______ ______ she ______ to London yesterday？
5. Let’s go swimming.(改为否定句)
Let’s _______ ___________ swimming.
三. 阅读理解
When some plates of the earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the earth. They often happen near the mountains.
　　During an earthquake, the shakings make rocks rise suddenly and even crack (断裂) open. Houses fall, people are killed or hurt, and sometimes the whole villages or cities are destroyed.
　　Can we do something to keep ourselves safe from earthquakes Scientists have studied earthquakes and make maps that show the “earthquake belts”. In areas (地区) in these belts, it’s possible for earthquakes to happen. In these areas we should build strong houses to fight against earthquakes.
　　In the future, scientists will be able to tell when and where an earthquake will be before they happen. They can also tell people what to do and how to do it.
1. A large number of earthquakes often happens _____.
A. in the area B. on land
C. at night D. next to mountains
2. The reason for an earthquake is _______.
A. the result of rock plate sudden movement
B. that there are so many plates on the earth
C. that the sea is too deep
D. rocks’ cracking open
3. A map showing the earthquake belts will tell people ______.
A. what kind of houses to build
B. what kind of houses can stay up in an earthquake
C. where earthquake may happen
D. how to keep themselves safe during an earthquake
4. In the future we’ll be no longer so afraid of earthquakes ______.
A. with the help of scientists’ exact prediction (预报)
B. because of a map showing the “earthquake belts”
C. because we can guess the date and place of earthquakes
D. as scientists know what to do and how to do it
5. Choose the best title for the passage.
A. An Earthquake B. A Scientist and an Earthquake
C. How to Fight Against Earthquake
D. Earthquakes Today and Tomorrow
四、作文。
请以你的切身经历就这个问题What should we do when a big fire happens 展开作文，字数60词左右。
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