初中英语外研版 (新标准)八年级下册Unit 2 We have not found life on any other planets yet教学ppt课件

这是一份初中英语外研版 (新标准)八年级下册Unit 2 We have not found life on any other planets yet教学ppt课件，共49页。PPT课件主要包含了课堂导入，Uranus 天王星，课堂活动，Writing，课堂小结等内容，欢迎下载使用。
没有一人；没有一个；一点儿也没有
太阳的;与太阳有关的 adj.
Wrds and expressins
slar system
办不到的, 不可能的 adj.
1. Hw many planets are there in ur slar system?
2. Is there any life n ther planets?
Put the wrds and expressins in the bx in rder: small – large.
galaxy, planet, slar system star, universe
1. planet 2. star 3. slar system 4. galaxy 5. universe
The Milky Way Galaxy
银河系主体部分的直径约为10万光年
银河系有太阳这样的恒星2000多亿颗
The slar system
Mercury 水星
Jupiter 木星
Neptune 海王星
Shenzhu-9 is a manned spaceship.
Wrk in pairs. Lk at the picture and talk abut what yu knw abut Chinese spaceships.
Reading and vcabulary
When yu read a passage with a title and pictures, think abut the wrds yu may find in the passage, and the questins yu may want t ask befre yu start t read.
Learning t learn
Read the passage and chse the best title fr it.
Anyne ut there? 2.Life n the earth 3. The sun and ther stars 4. The stars at night
________________________________
Scientists think that there has been life n the earth fr hundreds f millins f years. Hwever, we have nt fund life n any ther planets yet.
1. Anyne ut there?
The earth is a planet and it ges arund the sun. Seven ther planets als g arund the sun. Nne f them has an envirnment like that f the earth, s scientists d nt think they will find life n them. The sun and its planets are called the slar system, and ur slar system is a small part f a much larger grup f stars and planets, called the Galaxy r the Milky Way.
There are billins f stars in the Galaxy, andur sun is nly ne f them. Scientists have als discvered many ther galaxies in the universe. They are very far away and their light has t travel fr many years t reach us. S hw large is the universe? It is impssible t imagine. Scientists have sent spaceships t the planet Mars t take phts. They have even
sent spaceships t travel utside the slar system. Hwever, n spaceship has travelled far enugh t reach ther stars in ur Galaxy. Scientists have always asked the questins: with s many stars in the universe, are we alne, r is there life ut there in space? Have there been visitrs t the earth frm ther planets? Why has n ne cmmunicated with us? We d n knw the answers... yet.
1. The earth is a star. □2. The sun is a star. □3. There is mre than ne galaxy in the universe. □4. The light frm the stars in ther galaxies has travelled fr a lng time t reach us. □5. Scientists have received many messages frm space. □6. Spaceships have visited mst f the universe. □
Check (√) the true sentences.
Is there life n ther planets? There are seven ther planets in ur (1) ___________ ,but (2) _____ f them has a(n) (3)___________ like that f the earth. Spaceships frm the
Cmplete the passage with the wrds and expressin in the bx.
earth have dne surveys f the ther planets, but they have nt fund any life there. Why has n ne frm ther planets tried t (4) _____________with us? It is true that scientists have nt discvered life n ther planets in the (5) _________ yet, but sme scientists believe that they will find it sme day.
Lk at the picture frm a science stry fr children and answer the questins.
What have the scientists just received?(a message frm ne f ur spaceships)They have just received a message frm ne f ur spaceships.Where has the spaceship landed? (Mars)2. What has the spaceship discvered? (peple n Mars)
The spaceship has landed n Mars.
The spaceship has discvered peple n Mars.
3. Why have the peple n Mars nt sent us a message? (d nt knw hw t)4. Why have the peple n Mars nt visited us n the earth? (d nt knw hw t)
Because they d nt knw hw t sent a message t us.
Because they d nt knw hw t get t the earth.
Write a passage t describe the picture. Use yur answers t the questins in Activity 5 t help yu.
We have just received a message frm ur spaceship t Mars …
We have just received a message frm ur spaceship t Mars. Our spaceship has discvered aliens there. They have never sent us a message because they dn't knw hw t cmmunicate with us. They have nt visited the earth because they dn't knw hw t fly t ur planet, and they prefer life n Mars. They seem very happy n their planet. They have used parts frm the ther spaceships frm the earth t make TVs, radis, etc. We hpe they dn't d the same with this ne!
Pssible answer
Scientists think that there has been life n the earth fr hundreds f millins f years. 科学家认为地球上的生命已存在了数亿年。 hundreds f millins f 数亿…… We paid hundreds f millins f dllars in taxes. 我们交纳了数亿美元的税金。
Language pints
数词在表示模糊数目的短语中用复数形式，且后面要加上f。hundreds f 数以百计的thusands f 数以千计的millins f 数以百万计的billins f 数以亿计的, 数十亿的百、千、百万、十亿如果和具体数字连用，百、千、百万、十亿须用单数形式。如：six hundred tw thusand nine millin seven billin
2. The earth is a planet and it ges arund the sun. Seven ther planets als g arund the sun. 地球是颗行星，它围绕着太阳转。此外还有七颗行星也围绕着太阳转。1) 七颗行星指的是：水星（Mercury)、金星 (Venus)、火星(Mars)、木星 (Jupiter)、土星（Saturn)、天王星 (Uranus)和海王星(Neptune)。
2) g arund: 绕着……运转 The Earth ges arund the Sun.地球绕着太阳转。 Let's g arund the twn, nt thrugh it. 我们绕过这城镇吧，不要穿过去了。
3) ther/the ther/thers/anther这几个相类似的词容易弄混淆，其实意思大相径庭。ther其它的（人或物）, 后面经常跟可数名词复数形式； We haven’t fund life n ther planets yet. 我们还没有在其它的星球上发现生命。（其他的星球不可能只有一个）
the ther（两者中的）另一个,后面不可能跟复数形式； He has tw daughters. One is a teacher, the ther is a dctr. 他有两个女儿，一个是老师，另一个是医生。 （有且只有两个，两者中的另一个）thers其它的人或物（已经包括在内）, 后面不能跟名词，本身就含有名词的含义；
Sme peple came by car, thers came n ft. 有些人是坐汽车来的，其他人是走着来的。（thers后面不能再加名词）anther（三者以上中的，或不知道数量的）另一个, 后面也不可跟复数形式。 Wuld yu like anther cup f tea? 你要再来有一杯茶吗？（泛指再来一杯）
4) als adv. 也，同样；而且（不与否定式动词连用） She speaks French and German and als a little Russian. 她会说法语、德语，还会说一点儿俄语。 He is yung and gd-lking, and als very rich. 他又年轻又帅气，而且还很富有。 I teach five days a week and I als teach evening classes. 我每星期教五天，而且还教晚上的课。
比较：als/t/as wellals, t, as well都指句中有关词语与前面提到的事物相结合或相一致，这三个词语的雅俗程度和在句中的位置有所不同。 als含较庄重色彩，通常用于主要动词之前（但若主要动词为be，则放于其后）
I’ve met Jane and I’ve als met her mther. 我已见到简，我也见到了她的母亲。 She was rich, and she was als selfish. 她很富，她也很自私。t和as well比较通俗，通常用于从句的句尾。 I’ve read the bk and I’ve seen the film as well/t. 我看过这本书，也看过这部电影。
3. Nne f them has an envirnment like that f the earth… 没有一颗行星拥有与地球一样的环境……nne 表示（三个以上）一个也没有。意为“没有一个人/东西”，nne作主语时，谓语的单复数形式要根据实际情况来定。如： Nne f them has been t Beijing. 他们中没有一个人到过北京。（nne指代可 数名词， 强调单一性，谓语用单数形式）
Nne f them were aware f the danger. 他们都没有意识到危险。（nne指代可数名词，强调整体性，谓语用复数形式） Nne f the mney is his. 这些钱没有他的份儿。（nne指代不可数名词，谓语动词用单数形式）
4. ... and ur slar system is a small part f a much larger grup f stars and planets, called the Galaxy r the Milky Way.……我们的太阳系只是一个由恒星和行星组成的星系的一小部分，这个星系比太阳系大得多，称作银河系或银河。 这里的the Galaxy专指“银河系”，也可以 称作the Milky Way。而galaxy则泛指“星系”。例如： Scientists have discvered a distant galaxy. 科学家发现了一个遥远的星系。
本句中called the Galaxy r the Milky Way为过去分词短语做定语，修饰a much larger grup f stars and planets。类似的例子还有： They have a tw-year-ld sn called Mike. 他们有一个两岁的儿子叫迈克。
5. Hwever, n spaceship has travelled far enugh t reach ther stars in ur Galaxy. 然而，还没有任何航天器能到达银河系里的其他恒星。形容词/副词 + enugh t d表示“到达……程度，会发生某结果”。 He is ld enugh t g t schl. 他到上学的年龄了。 He gt up early enugh t catch the first bus. 他起得很早，赶上了首班车。
6. ... with s many stars in the universe, are we alne, r is there life ut there in space? ……宇宙中有这么多星球，我们是孤独的吗，抑或太空中还有其他生命存在呢？这里with s many stars in the universe是介 词短语，在句中作状语。with + 名词 + 介词短语,在句中做状语，表示伴随情况。 With s many things t d, we have n time t play. 要做的事情这么多，我们都没时间玩了。
alne adj.孤单的, 孤独的。作形容词时不作定语只作表语, 也可作副词。意思是“独自地”。 I dn’t like ging ut alne after dark. 我不喜欢天黑后独自外出。比较：alne/lnelyalne表示独自一人；lnely表示心灵上的孤单。 Althugh I’m alne, I dn’t feel lnely. 虽然我独自一人，但是我不感到孤单。
We have understd the fr identify specific infrmatin2. We have described a picture using the present perfect.3. We have grasped sme wrds and expressin invlving this unit.
1. In the wrld ___ peple like watching TV. A. millins f B. tw millins C. tw millin f D. tw millin f 2. Basketball is such a ppular game in the wrld that ____ peple play it fr fun and exercise. A. millin f   B. millins f   C. millins   D. tw millins f
3. ___ girls tk part in the Super Girl Cmpetitin, but nly a few f them succeeded.   A. One millin f   B. Millins f   C. Tw millins D. Tw millin f4. Every year ____ peple in this cuntry lse their jbs. A. many millins   B. millins f   C. millins   D. tw millins
5. The spaceship ______ will g arund the earth in 2005 will be called Shenzhu Ⅶ. A. which B. wh C. whm D. what 6. After playing ftball fr mre than half an hur, the students tk _____ rest. A. a few minute’s B. a few minutes’ C. a little minute’s D. a little
7. —Hw heavily it rained this early mrning! —Yes. But ________ f the students in ur class was late fr schl. A. sme B. nne C. all D. neither 8. I tried several jackets n, but ____ f them lked gd. A. bth   B. either   C. nne   D. neither
1. 地球是行星，它围绕太阳运转。 The Earth is a planet and it_____________ the Sun.2. 为什么不把书带回来？ ____________________ the bk?3. 没有一个学生去过英国。 _______ the students __________ England.
Why nt bring back
根据汉语提示完成英语翻译。
4. 完成今天的作业不容易。 _______________ tday’s hmewrk.5. 我刚读过有关火星的书。 I ____________ bks _____ Mars.6. 从其他星系到我们这里要花费很多年。 It _____ many years _______ us frm ther galaxies.
It’s hard t finish
have just read abut
takes t reach