Unit 5 Understanding ideas (2)课件 （新教材）初中英语外研版八年级下册（2024））

这是一份初中英语外研版（2024）八年级下册（2024））Unit 5 Looking into natureUnderstanding ideas课堂教学课件ppt，共27页。PPT课件主要包含了doing，to do，宾语从句，主句主语+谓语，+ 引导词that，只用whether，陈述语序，主句一般现在时，从句一般现在时，从句现在进行时等内容，欢迎下载使用。
通过本课时的学习，学生能够：1. 正确理解宾语从句的概念，在语境中归纳总结引导词that，if/whether的用法；2. 准确使用that，if/whether引导的宾语从句；3. 增强对自然探索的兴趣。
Learning bjectives
I like apples.I can't find him. Lucy finished ding her hmewrk.Lili wants t g fishing. I think that we shall becme gd friends.
放在动词后面作宾语的句子，我们称为宾语从句。
Read and find
Find ut the bjects in the fllwing sentences.
Read the sentences and translate them. Pay attentin t the wrds in red.
(a) Fr hundreds f years, peple believed that dinsaurs lked like huge lizards.(b) They can tell us whether dinsaurs had feathers, but that's nt all.
Read and translate
that, if/whether引导的宾语从句
Nw find mre sentences with these structures in the reading passage.
Hwever, thanks t a piece f amber, scientists nw knw that this idea is wrng.
They als help us understand that life n earth has always changed.
But the find prves that it did 35 millin years ag.
In the future, amber may als help us discver if ther species have changed ver time.
Research shws that they are a cmpletely new species.
Scientists used t believe that ants came frm the nrthern half f the earth.
Wh knws whether this piece f amber will tell us mre secrets?
Peple believed that dinsaurs lked like huge lizards.Scientists nw knw that this idea is wrng.They als help us understand that life n earth has always changed.Research shws that they are a cmpletely new species.
+ 从句（主语+谓语+其他）
Read and think
They can tell us whether dinsaurs had feathers.Wh knws whether this piece f amber will tell us mre secrets?Amber may als help us discver if ther species have changed ver.
+ 引导词if/whether
that引导的宾语从句
当宾语从句的谓语动词表示肯定的概念，用来陈述一个事实、观点或情况（也就是陈述句）时，一般用that引导。
Read and learn
that “三无产品”无意义（没有意思）无成分（在句子中不做成分）无存在感（可以省略）
whether/if“两有一无”有意义（有意思）有存在感（不能省略）无成分（在句子中不做成分）
当主句的谓语动词后面需要接一个“是” 或 “否”的问题时，我们用whether 或 if来引导这个宾语从句。
Observe the sentences and fill in the blanks.
1. I dn't knw whether/if it will rain tmrrw.2. I dn't knw whether he will cme r nt.3. It depends n whether he has time.4. He hasn't decided whether t g r stay.
Observe and fill
宾语从句使用_______语序：主语+谓语+其他.
I hpe that yu can jin us ne day.Culd I ask if yu’ve mentined this t her?I want t knw whether he will cme t the party.
主句的时态是一般现在时，宾语从句的时态可以是________时态。
I knw that he lives in Zhejiang.I believe that yu are telling the truth.I dn't knw if there will be a bus any mre.
主句的时态是一般过去时，宾语从句的时态是________的某种时态。
当宾语从句所表示的是客观事实、真理时，不管主句用什么时态，从句都用一般现在时。He tld me that the earth ges arund the sun.他告诉我地球绕着太阳转。
She asked if I was hungry.He said (that) he was wrking hard at that time.
Cnnect the sentences with that, if r whether.
1. Is there life in uter space? Scientists aren't sure.2. “I want t be a scientist and study plants," Jhn tld his parents.3. Is Mr Brwn interested in insects r birds? Emily wants t knw.
Scientists aren’t sure if / whether there is life in uter space.
Jhn tld his parents that he wanted t be a scientist and study plants.
Emily wants t knw if / whether Mr Brwn is interested in insects r birds.
Read and cnnect
Cmplete the messages with that, if r whether.
MESSAGE BOARDHell, I went t yur museum tday. Yu missed Plut in the mdel f the slar system. There were nly eight planets in it. I dn't knw 1_____________ this is a mistake.
if / whether
Read and cmplete
Dear Daniel,In the past, peple thught 2__________ there were nine planets. Hwever, questins were raised abut 3__________ Plut was a planet. In 2006, scientists agreed 4__________ a true planet: 1. mves arund the sun 2. is rund (r nearly rund) 3. can clear things in its wayPlut desn't meet the third pint. Therefre, we nw believe 5_______ there are eight true planets in the slar system. That's why Plut isn't part f the mdel. Please let me knw 6__________ yu need mre infrmatin.
Read the ntice
Grup wrk. Decide n ne discvery and answer the questins.
1. What is the discvery?2. Wh made the discvery?3. What’s amazing abut it?4. What can yu learn frm it?
→Useful expressins· Fr hundreds f years, peple believed that...· ... made an amazing discvery.· By…., ... fund / realised / saw that...· It prves that...· It teaches us that...· Research shws that..
Disucss and answer
Discuss and answer
Fr hundreds f years, peple believed that...; The discvery f... has changed ld beliefs abut...; By..., ... fund/realised/saw that...; Research shws that...
By..., ... fund/realised/saw that...; ... made an amazing discvery.
It’s amazing that...; What’s amazing is that...; It prves that...; Research shws that...; ... unlck the secrets f nature.
It teaches us that...; I can learn that...; We shuld put mre effrt int...
1. What is the discvery?
By watching and listening carefully, scientists have discvered that whales use these sunds t talk t each ther in the cean.
Fr hundreds f years, peple believed that...; The discvery f... has changed ld beliefs abut...; By..., ... fund / realised / saw that...; Research shws that...
2. Wh made the discvery?
In the 1960s, a scientist named Rger Payne studied humpback whales. He made an amazing discvery. Their sunds were special repetitive patterns, just like human sngs.His research shws that whale sngs can travel very far underwater. Whales use these sngs t share infrmatin, find fd and lk fr friends. Smetimes, many whales sing the same sng, and the sng can change ver time.
3. What’s amazing abut it?
By..., ... fund / realised / saw that...; ... made an amazing discvery.
4. What can yu learn frm it?
This discvery teaches us that animals have smart ways t cmmunicate. If we pay attentin, we can learn many wnderful things abut nature.
Let’s write
Write a shrt passage abut discveries in nature explratin and share it with us.
Sme whales make lng, lw sunds during swimming. Peple ften wnder if the whales are singing. By watching and listening carefully, scientists have discvered that whales use these sunds t talk t each ther in the cean.In the 1960s, a scientist named Rger Payne studied humpback whales. He made an amazing discvery. Their sunds were special repetitive patterns, just like human sngs.His research shws that whale sngs can travel very far underwater. Whales use these sngs t share infrmatin, find fd and lk fr friends. Smetimes, many whales sing the same sng, and the sng can change ver time.This discvery teaches us that animals have smart ways t cmmunicate. If we pay attentin, we can learn many wnderful things abut nature.
The tense f bject clauses.
The bject clause must be in declarative wrd rder.
An bject clause is a clause that acts as the bject f a verb in the main sentence.