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(共29张PPT)
Unit 5
Unit 5 Looking into nature
学习宾语从句（that，if，whether）的意义及用法
能正确使用宾语从句完成练习
能够和同伴谈论在探索自然过程中取得的新发现
能够写一篇短文，话题为a discovery in nature exploration
能够和同伴互评短文，并知道如何改进
board
n. 布告牌，公告牌
木板
model
n. 模型
planet
n. 行星
The model on the board shows how each planet moves around the sun.
木板上的模型展示了每颗行星如何绕着太阳运行。
clear
v. 清除，清理
upload
v. 上载，上传
whale
n. 鲸
Clear the old pictures first, and then upload the new photo of the huge whales.
先清空旧图片，再上传这张巨鲸的新照片。
再读文章，找出文中含有that、whether、if的句子，并归纳这些句子的相似之处。
that 、whether、if都在谓语动词后，后面都跟着一个完整的句子，这个句子在整个句子中充当 _________。
宾语
For hundreds of years, people believed that dinosaurs looked like huge lizards.
They can tell us whether dinosaurs had feathers, but that’s not all.
谓语动词
谓语动词
宾语
宾语从句：放在动词后面作宾语的句子
宾语从句
宾语从句
Read the sentences from the reading passage and summarise the grammar rules.
However, thanks to a piece of amber, scientists now know that this idea is wrong.
Research shows that they are a completely new species.
Scientists used to believe that ants came from the northern half of the earth.
Read more sentences and find the grammar rules.
They also help us understand that life on earth has always changed.
But the find proves that it did 35 million years ago.
当谓语动词表示肯定概念，其后面的句子一般用that引导。that没有实际意义，只起语法作用，多数情况下that可以省略。
e.g. I hope (that) it will snow this winter.
我希望今年冬天会下雪。
I believe (that) we shall become good friends.
我相信我们会成为好朋友。
Betty thinks (that) trees can improve the air.
Betty认为数目可以改善空气质量。
常接that引导的宾语从句的动词有：believe, expect, explain, feel, hear, hope, imagine, prefer, promise, report, say, see, tell, think, understand, warn, wish等
并非所有的动词后面都可接that引导的宾语从句。
In the future, amber may also help us discover if other species have changed over time.
Who knows whether this piece of amber will tell us more secrets
Read more sentences and find the grammar rules.
如果我们要表达不确定的概念时，从句就要用whether或if来引导。它们在从句中不充当句子成分，但有含义，意为“是否”，故不可省略。
e.g. Tom wants to know whether /if he needs to come early tomorrow. Tom想知道他明天是否需要早来。
He asks whether / if we will go fishing on Sunday.
他问我们星期天是否会去钓鱼。
一般疑问句用作句子宾语时，也用连词whether或if引导。此时，原来的疑问语序需改为陈述语序。
Will Jenny go to Beijing tomorrow I don’t know.
→I don’t know if / whether Jenny will go to Beijing tomorrow.
Is the old man a doctor Sally asks Tom.
→Sally asks Tom if / whether the old man is a doctor.
Read more sentences and find the grammar rules.
主语在谓语的前面
两个引导词whether和if如何选择呢？
宾语从句中没有or not的情况下，一般来说二者都可用；
从句中有or not的话，一般用whether，构成whether… or not…结构。
e.g. Do you know if / whether Lucy will take part in the sports meet
Do you know whether or not Lucy will take part in the sports meet
He does not know whether they will plant trees on Saturday or not.
Connect the sentences with that, if or whether.
1. Is there life in outer space Scientists aren’t sure.
2. “I want to be a scientist and study plants,” John told his parents.
3. Is Ms Brown interested in insects or birds Emily wants to know.
Scientists aren’t sure if / whether there is life in outer space.
John told his parents that he wanted to be a scientist and study plants.
Emily wants to know if / whether Mr Brown is interested in insects or birds.
当主句是过去时态时，从句用相应的过去时态
Connect the messages with that, if or whether.
MESSAGE BOARD
Hello,
I went to your museum today. You missed Pluto in the model of the solar system. There were only eight planets in it. I don’t know __________ this is a mistake.
whether / if
Dear Daniel,
In the past, people thought __________ there were nine planets. However, questions were raised about _________ Pluto was a planet. In 2006, scientists agreed _________ a true planet:
moves around the sun
is round (or nearly round)
can clear things in its way
Pluto doesn’t meet the third point. Therefore, we now believe __________ there are eight true planets in the solar system. That’s why Pluto isn’t part of the model. Please let me know _________ you need more information.
that
whether/if
that
that
whether/if
1. What is Daniel’s question on the message board
Daniel saw that the museum missed Pluto in the model of the solar system. He wants to know if / whether this is a mistake.
2. Why isn’t Pluto one of the planets in the solar system
In 2006, scientists agreed that a true planet: (1) moves around the sun; (2) is round (or nearly round); (3) can clear things in its way. Pluto doesn’t meet the third point.
3. What can you learn from the messages
People’s understanding of nature keeps changing.
Answer the questions according to the messages.
Most of us have been to museums. Have you ever wondered whether the things shown in museums are completely right or not
A science magazine is asking students to write about discoveries in nature exploration. What discoveries of nature do you know Talk with your partner and choose a discovery to write a short passage.
Look at the notice and get to know what you should include in your writing.
For hundreds of years, people believed that…
…made an amazing discovery.
By…, found / realised / saw that…
It proves that …
It teaches us that …
Research shows that…
Use the words and expressions from the reading passage and the Useful expressions to help your writing. Also, you can read the Upload to learn how to begin your writing.
提出观点
Scientists now know that…
Scientists used to believe that…
展示价值
Thanks to…,…
…can tell us…, but that’s not all.
…also help us understand that…
…proves that…
The discovery of…has changed old beliefs about…
As a window on the past, …
1. What is the discovery
For hundreds of years, people believed that...; The discovery of... has changed old beliefs about...; By..., ... found / realised / saw that...; Research shows that...
2. Who made the discovery
By..., ... found / realised / saw that...; ... made an amazing discovery.
3. What’s amazing about it
It’s amazing that...; What’s amazing is that...; It proves that...; Research shows that...; ... unlock the secrets of nature.
4. What can you learn from it
It teaches us that...; I can learn that...; We should put more effort into...
Some whales make long, low sounds during swimming. People often wonder if the whales are singing. By watching and listening carefully, scientists have discovered that whales use these sounds to talk to each other in the ocean.
In the 1960s, a scientist named Roger Payne studied humpback whales. He made an amazing discovery. Their sounds were special repetitive patterns, just like human songs.
What is the discovery
Who made the discovery
His research shows that whale songs can travel very far underwater. Whales use these songs to share information, find food and look for friends. Sometimes, many whales sing the same song, and the song can change over time.
This discovery teaches us that animals have smart ways to communicate. If we pay attention, we can learn many wonderful things about nature.
What’s amazing about it
What can you learn from it
Introduce what the discovery is and who made it.
Describe what is amazing about it.
Explain what can be learnt from it.
Use the words and expressions from the reading passage
and the Useful expressions.
Use object clauses correctly.
Evaluate each other’s short passage.
I can
理解宾语从句（that，if，whether）的意义及用法，并正确使用它
和同伴谈论在探索自然过程中取得的新发现，并将谈论内容形成一篇短文
和同伴互评短文，并知道如何改进
Polish your writing according to the evaluation sheet.
Preview Developing ideas.

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