Unit 4 重点句型导学案- 高中英语人教新课标必修三.docx

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1、新人教英语必修三 unit4导学案（三）课前巩固一、根据中文或首字母提示，填写所缺单词的适当形式。 1. There is a friendly a_ of helping each other with difficulties in study in our class. 2. It is possible to _ (繁殖) these bacteria in the laboratory. 3. By the time they reached the top of the mountain they were e_.4. There is a big underground rail

2、way _ (系统) in London, which is good for travellers.5. There is a v_ wind outside and the snow is so heavy.6. To work out this problem, we have tried many m_. 7. As a middle school student, you may find you are growing up _ (渐渐地).8. Oceans cover two thirds of the s_ of the earth while land covers one

3、 third of it.9. The earth is one of the nine p_ which go around the sun.10. Water _ (存在) in three forms, which are liquid, gas and solid.11. With the d_ of economy, peoples living standard is better and better now. 12. Knowing that he failed to pass the exam, he felt very d_ and unhappy.13. The wast

4、e gas from the factory is h_ to our health. 14. Li Bai was one of the greatest poets, while Zhang Heng was one of the most famous Chinese a_ in the world. 15. It is the third time that his novel was p_ in this company.二、请从下面方框中选择适当的单词或短语，并用其正确形式填空。in time, prevent from, depend on, cheer up, now that

5、, break outcool down, get the hang of, spread, presence, explode, exist1. The coffee is _, so youd better drink it right now, or it will be too cold for you.2. Before ordering rooms for them, youd better make sure how many people will be _ at the meeting.3. We must try to _ the new telephone system

6、before we use it so that we may use it freely.4. He was unhappy at first but soon _ after lunch. 5. The Sun is very important to the mankind. Man _ it for heat and light.6. You neednt work today. _ you are ill, you may have a rest at home.7. The First World War _ in 1914 and ended in 1918.8. If bird

7、s want to fly, they have to _ their wings and wave them up and down.9. Explorers have been sent to Mars to make sure whether life _ on it.10. On New Years Eve we may hear fireworks _ here and there. We dont think it noisy but exciting.11. I miss my hometown so much that nothing can _ me _ going back

8、.12. If we dont hurry up, we wont be _ to catch the airplane. Keys:单词拼写1. atmosphere2. multiply3. exhausted4. system5. violent 6. methods 7. gradually 8. surface 9. planets 10. exists 11. development 12. disappointed 13. harmful 14. astronomers 15. published选词填空1. cooling down 2. present 3. get the

9、hang of 4. cheered up 5. depends on 6. Now that7. broke out 8. spread 9. exists 10. exploding 11. prevent; from 12. in time经典原句默写与背诵1What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.随后它会变成什么没有人知道，直到4538亿年前，这团尘埃才慢慢地形成一个固体的球状物。2Th

10、is produces a chain reaction，which made it possible for life to develop.这产生了连锁反应，使得生命的发展成为可能。3But when I tried to step forward，I found I was carried twice as far as on the earth and fell over.但是当我试着向前迈步时，我发觉我被送出去很远，步子的跨度竟是在地球上的两倍，并且摔倒在地。 4.walking does need a bit of practice now that gravity has cha

11、nged.既然重力改变了，看来走路也的确需要练一练了。 重点句型详解1 They were in time to produce carbon，nitrogen，water vapour and other gases，which were to make the earths atmosphere.最终产生了碳、氮气、水蒸气和其他多种气体，从而形成了地球的大气层。be to do有五层意义：(1)表示预定，“预定”，相当于be going to do。(2)表示义务，“应该”，相当于should。(3)表示可能，“会做”，相当于can/could。(4)表示命运，“注定”(通常用于过去时，描

12、述过去的事实)。(5)用于if.were to do，引导对将来的虚拟语气。He is to return from Germany tomorrow.他明天将从德国回来。You are to be back by 9 oclock.你要在9点以前回家。完成句子(1)When are you to leave for home?你什么时候回家？(2)She is to be married next month.她将于下个月结婚。(3)You are to report to the police.你应该报警。2 .I found I was carried twice as far as o

13、n the earth and fell over.(当我向前迈步的时候)我发现我所走的距离是在地球上的两倍，并且跌倒了。倍数的表达方式：(1)倍数as.as.(2)倍数比较级than(3)倍数the size/height/length/width.of.(4)倍数what从句(5)倍数that of.Beijing is ten times the size of my hometown.北京是我家乡的十倍大。In our county now the grain output is six times that of before liberation.现在我们县的粮食产量相当于解放前的

14、六倍。夯实基础同义句改写The red ruler is three times as long as the yellow one.(1)The red ruler is two times longer than the yellow one.(用“倍数比较级”改写句子)(2)The red ruler is three times the length of the yellow one.(用“倍数then.of.”改写句子)3“Oh dear，” I cried，“walking does need a bit of practice now that gravity has chan

15、ged.”我大声地说：“天啊，既然重力改变了，走路也需要练一练了。”now that既然，由于，是连词词组，引导原因状语从句，表示明显的原因或既成的事实。口语中that常可省略。其他表示原因的连词或介词短语：because因为(语气较重，常用于回答why的疑问),since因为；既然(可与now that互换as因为(语气较弱)for因为(并列连词，引导一个分句，不能置于句首，表示进一步补充说明)due to，because of，on account of，owing to，thanks to，as a result of等Now that the children know，we can

16、tell everyone else.既然孩子们知道了，我们就可以告诉其他人了。夯实基础用适当的连词填空(1)Now that youre here，why not have a drink?(2)Since it is late I shall go home now.(3)The school was moved out of downtown as the number of students had grown too large.(4)It must have rained last night，for the ground is wet.4、This produced a chai

17、n reaction，which made it possible for life to develop这就产生了一系列的反应，使得生命就有可能开始发展了。【要点提炼】it作形式宾语。句中made it possible for life to develop属于 “v.(动词)itadj./n.(宾补)to do/that从句”结构。该结构中，it作形式宾语，真正的宾语是后面的不定式或that从句。常用于此结构中的动词还有：think，believe，find，consider，feel等。I find it hard to remember (remember)these words i

18、n a short time.我发现在短时间内记住这些词很难。I must make it clear that I'll always support you.我必须说清楚我会一直支持你。I think it useful to drink some hot milk before sleep.我认为睡前喝点热牛奶有作用。5、When we get closer to the moon，we shall feel its gravity pulling us，but it will not be as strong a pull as the earth's当我们更接近月球时

19、，就会感到月球的引力在拉我们。但是，月球的引力不像地球的引力那么大。as strong a pull as the earth's 属于“asadj.a/ann.as”结构，意为“像一样的”，其中的名词必须是可数名词的单数形式，此结构用于否定句中可用“not so/as.as.”结构。as.as.结构的具体形式有：as/so形容词a/an可数名词单数as.像一样的as/so形容词/副词原级as.像一样He is so clever a boy as everyone likes.他是一个人人都喜欢的聪明孩子。His bedroom is not as/so neat as his el

20、der sister's.他的卧室没有他姐姐的整洁。You've made as many mistakes as I have.你犯的错误和我犯的一样多。课后小练课文缩写The earth was just a cloud of energetic dust after the “Big Bang”Then the dust 1._ into a solid globe moving around the sun. The earth 2._ loudly with fire and rock，to be 3._ to produce many things，which ma

21、de the earths atmosphere. Water stayed on the earth and people think it is important for the beginning of life. It allowed the earth to dissolve 4._ gases. Then life began to develop.Plants were the start of changes. They 5._ and filled the oceans and seas with oxygen. This encouraged the 6._ of ear

22、ly shellfish and fish. Land animals such as insects，reptiles and dinosaurs and so on appeared after the first green plants appeared. Small clever animals 7._ all over the earth. But they are not 8._ the earth very well. Too much carbon dioxide is put into the atmosphere，which 9._ heat from escaping

23、from the earth into space. Whether life will continue 10._ whether this problem can be solved.完成句子1No one knows exactly _，as it happened so long ago.没有人确切知道地球是怎样形成的，因为在很早以前它就形成了。2The earth became so violent that _ the shape would last or not.地球变得激烈动荡，不知道这个固体形状是否会继续存在下去。3It was not immediately obviou

24、s that water _ the development of life.水对生命的发展会起关键作用，这一点在当时并不明显。4_ is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.很多科学家相信，由于地球上长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。5They are putting too much carbon dioxide into the atmosphere，_ the eart

25、h into space.他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去。6So whether life will continue on the earth for millions of years to come will depend on _.所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。Keys：1.settled2.exploded3.in time4.harmful5.multiplied6.development7.spread8.looking after 9prevents10.depends on1.how the earth began2.it was not clear whether 3was to be fundamental to4.What many scientists believe5.which prevents heat from escaping from 6whether this problem can be solved7