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(共25张PPT)
册 次：八年级下册 学 科：英语（外研社版）
Unit 5 Looking into nature
Understanding ideas (语法学习)
Review the story.
Let’s retell.
about the dinosaur
about the flower
about the ants
A层
a window on the past
a key to unlock more secrets of nature
Review the story.
1. secrets
2. Thanks to
3. (always) changed
4. 35 million / thirty-five million
5. unknown
6. ant
7. window
8. nature
Let’s retell.
B/C层
动词
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
A/B/C层
Read and find.
A/B/C层
However, thanks to a piece of amber, scientists now know that this idea is wrong.
They also help us understand that life on earth has always changed.
But the find proves that it did 35 million years ago.
In the future, amber may also help us discover if other species have changed over time.
Research shows that they are a completely new species.
Scientists used to believe that ants came from the northern half of the earth.
Who knows whether this piece of amber will tell us more secrets
Read and find.
表示肯定或陈述内容时，用that引导宾语从句。
表示“是否”这种不确定的概念时，用if或whether引导宾语从句。
A/B/C层
Connect the sentences with that, if or whether.
A/B层
Connect the sentences with that, if or whether.
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.
A/B层
Scientists aren’t sure
John told his parents
Mr Brown is interested in insects or birds.
if / whether
there is life in outer space.
that
he wanted to be a scientist and study plants.
if / whether
Emily wants to know
Connect the sentences with that, if or whether.
C层
一般疑问句，表示“是否”，用if或whether引导
肯定句，表示肯定或陈述内容，用that引导
一般疑问句，表示“是否”，用if或whether引导
一般过去时
Complete the messages with that, if or whether.
A/B/C层
Complete the messages with that, if or whether.
if / whether
that
if / whether
that
that
if / whether
A/B/C层
1. What is Daniel’s question on the message board
2. Why isn’t Pluto one of the planets in the solar system
3. What can you learn from the messages
Read and answer.
A/B层
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.
Read and answer.
A/B层
1. What is Daniel’s question on the message board
2. Why isn’t Pluto one of the planets in the solar system
Read and answer.
C层
if / whether
that
if / whether
that
that
if / whether
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.
Read and answer.
C层
if / whether
that
if / whether
that
that
if / whether
A/B/C层
Task
Read the notice.
Group work. Decide on one discovery and answer the questions.
1. What is the discovery
2. Who made the discovery
3. What’s amazing about it
4. What can you learn from it
A层
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...
Group work. Decide on one discovery and answer the questions.
B层
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...
Group work. Decide on one discovery and answer the questions.
Example
By watching and listening carefully, scientists have discovered that whales use these sounds to talk to each other in the ocean.
C层
2. Who made the discovery
By..., ... found / realised / saw that...; ... made an amazing discovery.
Group work. Decide on one discovery and answer the questions.
Example
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.
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.
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.
C层
4. What can you learn from it
It teaches us that...; I can learn that...; We should put more effort into...
Group work. Decide on one discovery and answer the questions.
Example
This discovery teaches us that animals have smart ways to communicate. If we pay attention, we can learn many wonderful things about nature.
C层
Write your passage.
A/B/C层
Sample
Let’s check in pairs. Then share in class.
A/B/C层
Evaluation criteria:
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.
Homework
Further polish your writing.
A/B/C层
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