新人教版高中英语必修三Unit4《Astronomy the science of the stars》精品教案

1、标题新人教版高中英语必修三unit4astronomy: the science of the stars精品教案课型 language points编订人上课时间wednesday目标1) to grasp the main usages of some key words and phrases.2) to comprehend the content of the passage.3) to understand the contributions of great scientists.重难点words usages and the content of the passage.教学环

2、节与内容getting readyreview what they learned last class. language learning and using（知识扫描）1. lay(p26)【原句再现】they produced young generally by laying eggs.【自主探究】the hens dont lay (eggs) during this cold weather.please lay the book on the table【归纳总结】lay vt&vi, 含义_,_.【知识链接】巧记lie和lay躺 lie, lay, lain, lie in

3、bed again;撒谎 lie, lied, lied, dont be a liar;产蛋 lay, laid, laid, a hen laid an egg; 放置 a boy picked it up, and laid it in the bag.【即景活用】用lie&lay正确形式填空if you like, you can _ down on your bed, _ yourself in a comfortable position, and _ to yourself that you dont like _ there, or you can imagine where

4、you would like to _ the eggs after the hens _ eggs.2. exist（p26）【原句再现】they laid eggs too and existed on the earth for more than 140 million years.【自主探究】nobody knows whether there exists life on other planets.【归纳总结】exist vi. 不用进行时态；there exist意思是_,是there be句型的变体，类似结构有：there stand/lie/live/occur等。【知识链

5、接】existence n. come into existence=come into being开始存在，成立【即景活用】there _ a good way to solve many diffcult physics problems.(03 广东)a. are b. has c. exists d. be3. remain（p26）【原句再现】why they suddenly disappeared still remains a mystery.【自主探究】 she remained silent. in fact, the work remained unfinished th

6、e old man remained full of energy.it remains to be seen whether you are right.the remaining students will serve for the audience. =the students left will serve for the audience.【归纳总结】remain是系动词，意思是“仍然是，保持不变” ；后接名词、形容词 、分词和介词词组； sth remain to be done意思是“仍需，尚待”；remaining为形容词，意为剩余的, 常作前置定语；left也意为_, 它只

7、能作_定语。【即景活用】：having a trip abroad is certainly good for the old people, but it remains_ whether they will enjoy it.a. to see b. to be seen c. seeing d. seen【拓展提高】： why they suddenly disappeared 在句中作主语，我们称其为_从句；主句的谓语动词使用单数。4. allowto do(p26)【原句再现】it allowed the earth to dissolve harmful gases and aci

8、ds into the oceans and seas. passengers are not allowed to smoking. we dont allow smoking in our house.【归纳总结】允许某人做某事_, allow doing_, sb be allowed to do sth_.【即景活用】在我们餐馆里不准吸烟. we dont _ in our restaurant.5. preventfrom(p26)【原句再现】they are putting too much carbon dioxide into the atmosphere, which pre

9、vents heat from escaping from the earth into space.【自主探究】we are prevented/kept/stopped from having breakfast in the classroom.【归纳总结】：prevent (from) doing sth. _同义词组：stop (from)，keepfrom（此处from不能省）【即景活用】in order to keep the children _ swimming in the river, mr. smith kept them _ staying home all day.

10、(2007烟台模拟)a. from, from b. from,不填 c. 不填，from d. 不填, 不填6. depend on【原句再现】so whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.【自主探究】well all depend on you to make a decision.whether to hold the sports meeting or not will depend on

11、 the weather.【归纳总结】depend on sb/ sth.依靠指望某人/某物, depend on sb to do sth_【知识链接】depend在口语中意为“看情况而定”，可以有that depends, it depends, it all depends等几种说法。【即景活用】 我们的成败取决于是否每个人都努力工作。our success _ whether everyone works hard or not. how often do you eat out? -_, but usually once a week.(天津04高考)a. have no idea

12、b. it depends c. as usual d. generally speaking7. be to do（p25）【原句再现】what it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.【自主探究】they said goodbye, not knowing that they were never to meet again. the train is to arrive in beijing at

13、10:25tell her she is not to be back late!【归纳总结】be to do常用来表示后来不可避免将要发生的事，或命中注定的事；表示按计划、安排要发生的动作；表命令【即景活用】选择正确答案 in such dry weather, the flowers will have to be watered if they _.a. have survived b. are to survive c. would survive d. will survive the students were told that they _ at the school gate

14、 at 2:00 the following afternoon.a. met b. will meet c. were to meet d. were met8. as well as(p26)【原句再现】others, called amphibians, were able to live on land as well as in the water.【自主探究】 the child is lively as well as healthy. helen as well as i is eager to see the performance.【归纳总结】as well as是并列连词

15、，连接两个并列单词和短语, 译为_; as well as连接两个并列成分作主语时，句子的谓语动词应与_（前面/后面）那个名词或代词的人称和数保持一致。as well as还意为“与一样好”【即景活用】 we expect her to do the housework as well as _ _ the children.我们不仅指望她照看孩子，而且指望她做家务。 john plays football _, if not better than, david.a. as well b. as well as c. so well d. so well as翻译：he can speak

16、french as well as english.【知识链接】 well表示“也”的意思，常放在句末，与too的位置相同，但too前面有逗号, 两者都用于肯定句句中；either亦作“也”解，前面也有逗号，但用于否定句中。 讨论斜体字部分含义:since nobody else wants the job, we may/might as well let him have it. 结构类似的词组：as far as im concerned(就我而言), as long as(只要)自我评价：iii. consolidation(巩固练习)1. the teacher as well as

17、 a number of students _ to attend the party yesterday.a. were asked b. was asked c. were asking d. was asking2. no one can prevent the plan _.a. from carrying outb. to carry outc. being carried outd. to be carried out3. they dont allow _ here. that is to say, we are not allowed _ here.a. to smoke; t

18、o smoke b. smoking; smokingc. to smoke; smoking d. smoking; to smoke4. please remain _ until the plane has come to a complete stop.a. to seat b. to be seated c. seating d. seated5. translation: 英译汉：he decided to go to college， which was to change his fate._ 汉译英：就我而言，对外层空间的探索不仅能帮我们更多的了解宇宙（the universe), 而且能帮我们更好的知道我们自己的家-地球。_iv. mini-writing(微型写作)最近有人提出探索外层空间耗资太大，这部分资金应该用在治理地球环境污染上。你是怎么看待这个问题的呢？请写56个句子的英文短文，阐述自己的观点。要点提示： 随着科技的发展（withdoi