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

这是一份外研版 (新标准)八年级下册Unit 2 We have not found life on any other planets yet评课ppt课件，共55页。PPT课件主要包含了universe，galaxy，star，planet，Discuss，中考链接，Writing，Exercise等内容，欢迎下载使用。

nneenvirnmentthatslarsystemslar system
prn.没有一人；没有一个，一点也没有n.环境prn.那，那个adj.太阳的n.系统，体系星系，太阳系
New wrds and phrases
grupgalaxyuniverselightimpssibleutcmmunicate
n.群，组n.星系n.宇宙n.光；光线；光亮 adj.不可能的，办不到的adv.在远方v.联系，交流
slar system
D yu knw the wrds and expressins in the bx? Put them in rder: small — large.
galaxy B. planet C. slar system D. star E. universe
B — D — C — A — E
Hw many planets are there in the universe?
2. Is there any life n ther planets?
Reading and vcabulary
Wrk in pairs. Lk at the picture and talk abut what yu knw abut Chinese spaceships.
Shenzhu-9 is a manned spaceship.
Wh were n the spaceship?
Jing Haipeng, Liu Wang and Liu Yang.
When did it land n the space?
On June 16, 2012.
___________________ Scientists think that there has been life n earth fr hundreds f millins f years. Hwever, we have nt fund life n any ther planets yet.
Read the passage and chse the best title fr it.
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, and ur 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.
It is impssible (fr sb.) t d sth.对某人来说做某事是不可能的
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 dnt knw the answers… yet.
When yu read a passage with a title and pictures, think abut the wrds yu mayfind in the passage, and the questins yumay want t ask befre yu start t read.
Learning t learn
1. Anyne ut there?2. Life n Earth3. The sun and ther stars4. The stars at night
Enjy a vide.
Check(√) the true sentences.
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.
The 1st Para. Questins:
1. Hw lng has there been life n the earth? 2. Have we fund life n any ther planets yet?
There has been life n the earth fr hundreds f millins f years.
N, we haven’t.
1.What is called the slar system? What is it?
It is a small part f the Galaxy / the Milky Way.
The 2nd Para. Questins:
The sun and its planets are called the slar system.
2. Why dn’t scientists think they’ll find life n the ther planets?
Because nne f them has an envirnment like that f the earth.
Because they are very far away and their light has t travel fr many years t reach us.
The 3rd Para. Questins:
What have scientists discvered?2. Why is it impssible t imagine hw large the universe is?
They’ve discvered many ther galaxies in the universe.
The 4th Para. Fill in the blanks.
Scientists have ______ spaceships t the planet Mars t ____________. They have even sent spaceships t _____________ the slar system. Hwever, n spaceship has travelled ___________ t reach ther stars in ur Galaxy.
travel utside
Cmplete the passage with the wrds and expressin in the bx.
cmmunicate envirnment nne slar system universe
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
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.
Language pints
1. Scientists think that there has been life n the earth fr hundreds f millins f years.
n the earth 在地球上
n earth 世界上；究竟
fr +时间段，表示一段时间，用hw lng来提问。
— _________ d yu sleep everyday, Eric?— Fr abut eight hurs.A. Hw much　　　 B. Hw fast　　　 C. Hw ften D. Hw lng
hundred 前加基数词，表示“一百、二百、三百……”，hundred要用单数形式；hundred与f连用表示“数百”时，hundred 要用复数形式，即hundreds f。
thusand, millin, billin和hundred的用法相同。
2. Nne f them has an envirnment like that f the earth...
nne“没有一个”做主语时，谓语动词可用单数形式或复数形式。 nne 与f连用表示范围，后接不可数名词做 主语时，谓语动词只能用单数形式。
注意：nne 与n ne/nbdy的区别： nne既可指人也可指物，通常与表范围的f 短 语连用；n ne/nbdy只能指人，不能与f短 语连用。
(2) nne与数量有关，可回答hw many问句，表 示“一个也没有”；而n ne表示“什么人也 没有”，可回答wh问句。
— I tried several ways t wrk ut the math prblem, but ______ f them wrked.— Never give up! I believe yu’ll make it.A. all　　　 B. each　　　 C. nne D. neither
that是指示代词。为避免重复，可用 that 或 thse 来代替前面已提到过的人或事物。
The ppulatin f Shanghai is much larger than ______ f Nanning.
3. Hwever, n spaceship has traveled far enugh t reach ther stars in ur Galaxy.
... enugh ... + t d sth. 做某事……是足够的adj./ adv. + enugh + t d sth. 足够……做某事nt + adj./ adv. + enugh + t d sth. 不够……做某事
(1) 我们有足够的钱花。 We have _____________________.(2) 他跑得够快，很快追上了我们。 He ran ______________ catch up with us sn.(3) 他年龄不够大，照顾不了自己。 He _________________________________.
enugh mney t spend
fast enugh t
isn’t ld enugh t lk after himself
— We shuldn’t wrry abut Mary.— Yu are right. She is ______ t lk after ______.ld enugh; herself B. big enugh; herself　　　 C. enugh ld; her D. enugh big; her
with +宾语+ 宾语补足语，是with的复合结构，在句中作状语，表示伴随。宾语补足语可由现在分词、过去分词、副词、动词不定式或介词短语等来充当。
4. With s many stars in the universe, are we alne...
With s many things t d, we have n time t play.
— Why d yu always sleep ______?— Because I’m afraid f the dark.A. by yurself B. with the dr pen C. with the windw pen D. with the light n
alne作形容词， 意为“孤单的，独自的”， 只能作表语。
我独自在教室里。I was alne in the classrm.
alne还可作副词，意为“只有；仅仅；单独地”。
你不能仅靠面包维生。Yu can’t live n bread alne.
辨析：alne与lnely
alne侧重于说明独自一人，没有人陪伴，不强调主观感情；而lnely形容人时，则表示情感上“孤独的；寂寞的”，常作表语。
串记：My grandmther lives alne, but he desn’t feel lnely.
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.
1. Where has the spaceship landed? (Mars)
It has landed n Mars.
2. What has the spaceship discvered? (peple n Mars)
It has discvered peple n Mars.
4. Why have the peple n Mars nt visited us n the earth? (d nt knw hw t)
They d nt knw hw t visit us n the earth.
3. Why have the peple n Mars nt sent us a message? (d nt knw hw t)
They d nt knw hw t send us a message.
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 …
Pssible answer 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 and s n. We hpe they will live happily with us ne day!
一、根据句意或者括号所给的中文提示填写单词。
1. There is the earth, the sun, the mn and many ther stars in the u________.2. We shuld try ur best t prtect the e___________.
3. I want t knw hw they _____________ (交流) in the past.4. It’s ___________(不可能的) fr yu t d it.5. The ld man is a____. N ne lives with him.
cmmunicated
1. — The 15th Chinese Bridge — Chinese Prficiency Cmpetitin will be held this year. — That’s great! _________ freign cllege students are interested in Chinese learning. A. Hundred f B. Thusands C. Hundred D. Thusands f