外研版（2019）选择性必修第二册 Unit5 A delicate world Using language 公开课课件(共41张PPT)
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| 名称 | 外研版（2019）选择性必修第二册 Unit5 A delicate world Using language 公开课课件(共41张PPT) |  | |
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| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2023-03-04 08:36:57 | ||
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(共41张PPT)
Using language
Unit 5 A delicate world
目录
contents
Grammar
Vocabulary building
Homework
Listening & speaking
I
II
III
Ⅳ
I
Grammar
a. No visitor would think it surprising that the island is
a UNESCO World Heritage Site.
b. No visitor would think that the island being a
UNESCO World Heritage Site is surprising.
Grammar: It as an empty object
Look at the sentences and answer the questions.
c. Experts felt it necessary to come up with a plan to
remove all the rabbits from the island.
d. Experts felt to come up with a plan to remove all the
rabbits from the island was necessary.
1. What does “it” refer to in sentences (a) and (c)
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
“It” in sentence (a) refers to “the island is a UNESCO World Heritage Site”.
“It” in sentence (c) refers to “to come up with a plan to
remove all the rabbits from the island”.
2. What is the difference between the sentences in
each group
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
When the object of a sentence is a that-clause (b) or an infinitive (d), we sometimes use “it” as an empty object and put the real object later to keep balance. For example, sentence (a) uses “it” as the empty object of
2. What is the difference between the sentences in
each group
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
“think”, referring to the real object: “the island is a UNESCO World Heritage Site”. Sentence (b) uses that-clause as the object of “think”.
Grammar: It as an empty object
cooperation
Work in pairs: Now look for more sentences with this structure in the reading passage, and summarise its use in your own words.
it 作为形式宾语的两种基本用法：
Grammar: It as an empty object
当动词不定式，动名词和从句在某个句中作宾语时，为了保持句子的结构平衡，常用it作形式宾语，而将真正的宾语放到句子后部去。
1） He found it not easy to learn a foreign language well.
他发现学好一门外语是不容易的。
2）I think it necessary that we have the meeting.
我认为我们开这个会是有必要的。
0,000 people reading my blog! b I love to photograph the rising sun, …
it 作为形式宾语的几种特殊情况：
Grammar: It as an empty object
1） 动词 + it + that 从句，常见于 take, have, put 等动词之后。
例：I take it that he will finish the task by himself.
我认为他能自己完成这项任务。
0,000 people reading my blog! b I love to photograph the rising sun, …
2） 动词 + it + when / if 从句，常见于appreciate, enjoy, like, prefer 等动词之后。
例: We really appreciate it if you could do us a favour.
如果您能帮助我们，我们会很感激。
Grammar: It as an empty object
0,000 people reading my blog! b I love to photograph the rising sun, …
3） 动词 + it + 介词短语 + that 从句，常见于 owe it to sb, take it
for granted 等结构中。
例：We owe it to you that we are still alive.
多亏有你，我们现在才仍然活着。
0,000 people reading my blog! b I love to photograph the rising sun, …
4） 动词 + it + 过去分词 +从句。
例：He made it known to everyone that he was right.
他让每个人都明白他是对的。
it 作为形式宾语的几种特殊情况：
it 作为形式宾语的几种特殊情况：
Grammar: It as an empty object
0,000 people reading my blog! b I love to photograph the rising sun, …
5） 动词 + 介词 + it + that 从句，常见于 look to, depend on,
insist on, stick to, answer for 等结构中。
例：She insisted on it that she was innocent.
她坚持说自己是无辜的。
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
The red-eared slider, a species of freshwater turtle, is native to the Southern United States and Northern Mexico. Due to its cute appearance, many people think keeping this turtle as a pet is a good idea. Recent years have seen more and more pet sliders escaping or being released from homes, and some owners believe to release them into the wild is no big issue.
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
These days, people have found to release these turtles into the wild is a threat to other species. Experts consider owners keeping their pets in an enclosed area important, and anyone unable to keep their pets should take them to an appropriate animal shelter.
Grammar: It as an empty object
many people think keeping this turtle as a pet is a good idea
many people think it a good idea to keep this turtle as a pet
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Rewrite the underlined parts using it as an empty object.
believe to release them into the wild is no big issue
believe it no big issue to release them into the wild
Grammar: It as an empty object
people have found to release these turtles into the wild is a threat to other species
people have found it a threat to other species to release these turtles into the wild
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Experts consider owners keeping their pets in an enclosed area important
Experts consider it important for owners to keep their pets in an enclosed area
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Look at the pictures of the Saihanba National Forest Park and describe its changes using it as an empty object where appropriate.
present day
1960s
Grammar: It as an empty object
nouns / adjectives
to do / that
breakthrough
impossible
likely
unrealistic
...
grow
investigate
plant trees
transform
...
I think it a breakthrough to transform a desert into a forest ...
You may refer to the words and expressions in the table for help.
Grammar: It as an empty object
Now work in pairs. Describe how a place you know has changed using it as an empty object where appropriate.
II
Vocabulary building
0,000 people reading my blog! b I love to photograph the rising sun, …
1. absorb __________________
2. dissolved nutrients __________________
3. rely on __________________
4. provide energy __________________
吸收，摄入
溶解的营养物质
依靠，依赖
提供能量
Vocabulary building: Ecosystems
Pay attention to the words and expressions in bold.
0,000 people reading my blog! b I love to photograph the rising sun, …
5. feed on ____________________
6. prey on ____________________
7. break down ____________________
8. release ____________________
以……为食
捕食，掠夺
Vocabulary building: Ecosystems
分解
释放
Pay attention to the words and expressions in bold.
Vocabulary building: Ecosystems
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
1.What does the diagram show
The diagram shows a food chain – the connection between the living things.
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
2. What are the
relationships
between the
living things
The living things are closely connected with each other by the food they eat. Secondary consumers prey on primary consumers, primary consumers feed on producers, and producers
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
2. What are the
relationship
between the
living things
absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers.
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
Complete the passage with the correct form of the words and expressions.
In a woodland ecosystem, trees and other plants are producers. They water, and take in nutrients from the soil and energy from the sun. Insects are an example of a primary consumer. They the producers to provide food for them, and are by secondary consumers: small mammals and birds. They the primary consumers. Worms, fungi
absorb
rely on
fed on
prey on
Vocabulary building: Ecosystems
Complete the passage with the correct form of the words and expressions.
and bacteria are decomposers. They animal waste and the remains of living things. The chemicals these decomposers fertilise the soil and give the plants the nutrients they need to grow.
break down
release
III
Listening & speaking
Listening & speaking: Before listening
One of the oldest species in the ecosystem. the honey bee
has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour and
its wings can beat 200 times per second.
Injust one journey to collect pollen and nectar,one single
honey bee can pollinate asmany as50 to 100 flowers.
One of the oldest species in the ecosystem, the honey
bee has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour
and its wings can beat 200 times per second.
In just one journey to collect pollen and nectar, one
single honey bee can pollinate as many as 50 to 100
flowers.
Background information
Listening & speaking: While-listening
Listen to the conversation and choose the true statements.
Beesare very important to our food supply becausethey
provide honey.
2 The bee population is declining.
3 Without bees,humans would die out.
4 All human crops depend on beesfor pollination.
S If bees became extinct, other insectscould pollinate
1. Bees are very important to our food supply because they provide honey.
2. The bee population is declining.
3. Without bees, humans would die out.
4. All human crops depend on bees for pollination.
Listening & speaking: While-listening
Listen to the conversation and choose the true statements.
Beesare very important to our food supply becausethey
provide honey.
2 The bee population is declining.
3 Without bees,humans would die out.
4 All human crops depend on beesfor pollination.
S If bees became extinct, other insectscould pollinate
5. If bees became extinct, other insects could
pollinate enough crops.
6. Humans are responsible for the decline in the
bee population.
Listening & speaking: While-listening
A combination of things damages bee habitats, mainly ________________________________.
Listen again and complete the flow chart.
The bee population is ______________________. According to statistics, bee numbers in the US _______________________in just one year.
pesticides and climate changes
declining very quickly
have fallen by 17%
Without bees, crops would ___________________. _____________ would not be able to compensate for the loss of bees, because __________________ _______________________ of the species of crops.
Listening & speaking: While-listening
Listen again and complete the flow chart.
Animals that live on the crops _______________
be unable to reproduce
Other insects
bees are responsible
would die out
for pollinating about 70%
Humans have nothing to eat and die out.
Listening & speaking: Summary
have fun
You must be kidding! Are you sure about ...
I don’t believe it! Check it out for yourself ...
It’s a fact! According to statistics ...
Don’t forget that …
Expressing doubt Responding to doubt
Complete the boxes with the expressions from the conversation.
Listening & speaking: Summary
Expressing doubt Responding to doubt
You must be kidding!
I don’t believe it!
Are you sure about ...
It’s a fact!
Don’t forget that…
Check it out for yourself... According to statistics...
Complete the boxes with the expressions from the conversation.
Listening & speaking: Pair work
Work in pairs. Talk about what would happen to the ecosystem if another species died out. Use the words and expressions in this section.
Ⅳ
Homework
Homework
1. Summarize the usage of It as an empty object
and do the relevant exercises.
2. Describe how a place you know has changed
using it as an empty object where appropriate.
Using language
Unit 5 A delicate world
目录
contents
Grammar
Vocabulary building
Homework
Listening & speaking
I
II
III
Ⅳ
I
Grammar
a. No visitor would think it surprising that the island is
a UNESCO World Heritage Site.
b. No visitor would think that the island being a
UNESCO World Heritage Site is surprising.
Grammar: It as an empty object
Look at the sentences and answer the questions.
c. Experts felt it necessary to come up with a plan to
remove all the rabbits from the island.
d. Experts felt to come up with a plan to remove all the
rabbits from the island was necessary.
1. What does “it” refer to in sentences (a) and (c)
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
“It” in sentence (a) refers to “the island is a UNESCO World Heritage Site”.
“It” in sentence (c) refers to “to come up with a plan to
remove all the rabbits from the island”.
2. What is the difference between the sentences in
each group
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
When the object of a sentence is a that-clause (b) or an infinitive (d), we sometimes use “it” as an empty object and put the real object later to keep balance. For example, sentence (a) uses “it” as the empty object of
2. What is the difference between the sentences in
each group
Grammar: It as an empty object
Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage.
“think”, referring to the real object: “the island is a UNESCO World Heritage Site”. Sentence (b) uses that-clause as the object of “think”.
Grammar: It as an empty object
cooperation
Work in pairs: Now look for more sentences with this structure in the reading passage, and summarise its use in your own words.
it 作为形式宾语的两种基本用法：
Grammar: It as an empty object
当动词不定式，动名词和从句在某个句中作宾语时，为了保持句子的结构平衡，常用it作形式宾语，而将真正的宾语放到句子后部去。
1） He found it not easy to learn a foreign language well.
他发现学好一门外语是不容易的。
2）I think it necessary that we have the meeting.
我认为我们开这个会是有必要的。
0,000 people reading my blog! b I love to photograph the rising sun, …
it 作为形式宾语的几种特殊情况：
Grammar: It as an empty object
1） 动词 + it + that 从句，常见于 take, have, put 等动词之后。
例：I take it that he will finish the task by himself.
我认为他能自己完成这项任务。
0,000 people reading my blog! b I love to photograph the rising sun, …
2） 动词 + it + when / if 从句，常见于appreciate, enjoy, like, prefer 等动词之后。
例: We really appreciate it if you could do us a favour.
如果您能帮助我们，我们会很感激。
Grammar: It as an empty object
0,000 people reading my blog! b I love to photograph the rising sun, …
3） 动词 + it + 介词短语 + that 从句，常见于 owe it to sb, take it
for granted 等结构中。
例：We owe it to you that we are still alive.
多亏有你，我们现在才仍然活着。
0,000 people reading my blog! b I love to photograph the rising sun, …
4） 动词 + it + 过去分词 +从句。
例：He made it known to everyone that he was right.
他让每个人都明白他是对的。
it 作为形式宾语的几种特殊情况：
it 作为形式宾语的几种特殊情况：
Grammar: It as an empty object
0,000 people reading my blog! b I love to photograph the rising sun, …
5） 动词 + 介词 + it + that 从句，常见于 look to, depend on,
insist on, stick to, answer for 等结构中。
例：She insisted on it that she was innocent.
她坚持说自己是无辜的。
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
The red-eared slider, a species of freshwater turtle, is native to the Southern United States and Northern Mexico. Due to its cute appearance, many people think keeping this turtle as a pet is a good idea. Recent years have seen more and more pet sliders escaping or being released from homes, and some owners believe to release them into the wild is no big issue.
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
These days, people have found to release these turtles into the wild is a threat to other species. Experts consider owners keeping their pets in an enclosed area important, and anyone unable to keep their pets should take them to an appropriate animal shelter.
Grammar: It as an empty object
many people think keeping this turtle as a pet is a good idea
many people think it a good idea to keep this turtle as a pet
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Rewrite the underlined parts using it as an empty object.
believe to release them into the wild is no big issue
believe it no big issue to release them into the wild
Grammar: It as an empty object
people have found to release these turtles into the wild is a threat to other species
people have found it a threat to other species to release these turtles into the wild
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Experts consider owners keeping their pets in an enclosed area important
Experts consider it important for owners to keep their pets in an enclosed area
Rewrite the underlined parts using it as an empty object.
Grammar: It as an empty object
Look at the pictures of the Saihanba National Forest Park and describe its changes using it as an empty object where appropriate.
present day
1960s
Grammar: It as an empty object
nouns / adjectives
to do / that
breakthrough
impossible
likely
unrealistic
...
grow
investigate
plant trees
transform
...
I think it a breakthrough to transform a desert into a forest ...
You may refer to the words and expressions in the table for help.
Grammar: It as an empty object
Now work in pairs. Describe how a place you know has changed using it as an empty object where appropriate.
II
Vocabulary building
0,000 people reading my blog! b I love to photograph the rising sun, …
1. absorb __________________
2. dissolved nutrients __________________
3. rely on __________________
4. provide energy __________________
吸收，摄入
溶解的营养物质
依靠，依赖
提供能量
Vocabulary building: Ecosystems
Pay attention to the words and expressions in bold.
0,000 people reading my blog! b I love to photograph the rising sun, …
5. feed on ____________________
6. prey on ____________________
7. break down ____________________
8. release ____________________
以……为食
捕食，掠夺
Vocabulary building: Ecosystems
分解
释放
Pay attention to the words and expressions in bold.
Vocabulary building: Ecosystems
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
1.What does the diagram show
The diagram shows a food chain – the connection between the living things.
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
2. What are the
relationships
between the
living things
The living things are closely connected with each other by the food they eat. Secondary consumers prey on primary consumers, primary consumers feed on producers, and producers
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
2. What are the
relationship
between the
living things
absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers.
Questions
Answers
Look at the diagram and answer the questions.
Vocabulary building: Ecosystems
Complete the passage with the correct form of the words and expressions.
In a woodland ecosystem, trees and other plants are producers. They water, and take in nutrients from the soil and energy from the sun. Insects are an example of a primary consumer. They the producers to provide food for them, and are by secondary consumers: small mammals and birds. They the primary consumers. Worms, fungi
absorb
rely on
fed on
prey on
Vocabulary building: Ecosystems
Complete the passage with the correct form of the words and expressions.
and bacteria are decomposers. They animal waste and the remains of living things. The chemicals these decomposers fertilise the soil and give the plants the nutrients they need to grow.
break down
release
III
Listening & speaking
Listening & speaking: Before listening
One of the oldest species in the ecosystem. the honey bee
has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour and
its wings can beat 200 times per second.
Injust one journey to collect pollen and nectar,one single
honey bee can pollinate asmany as50 to 100 flowers.
One of the oldest species in the ecosystem, the honey
bee has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour
and its wings can beat 200 times per second.
In just one journey to collect pollen and nectar, one
single honey bee can pollinate as many as 50 to 100
flowers.
Background information
Listening & speaking: While-listening
Listen to the conversation and choose the true statements.
Beesare very important to our food supply becausethey
provide honey.
2 The bee population is declining.
3 Without bees,humans would die out.
4 All human crops depend on beesfor pollination.
S If bees became extinct, other insectscould pollinate
1. Bees are very important to our food supply because they provide honey.
2. The bee population is declining.
3. Without bees, humans would die out.
4. All human crops depend on bees for pollination.
Listening & speaking: While-listening
Listen to the conversation and choose the true statements.
Beesare very important to our food supply becausethey
provide honey.
2 The bee population is declining.
3 Without bees,humans would die out.
4 All human crops depend on beesfor pollination.
S If bees became extinct, other insectscould pollinate
5. If bees became extinct, other insects could
pollinate enough crops.
6. Humans are responsible for the decline in the
bee population.
Listening & speaking: While-listening
A combination of things damages bee habitats, mainly ________________________________.
Listen again and complete the flow chart.
The bee population is ______________________. According to statistics, bee numbers in the US _______________________in just one year.
pesticides and climate changes
declining very quickly
have fallen by 17%
Without bees, crops would ___________________. _____________ would not be able to compensate for the loss of bees, because __________________ _______________________ of the species of crops.
Listening & speaking: While-listening
Listen again and complete the flow chart.
Animals that live on the crops _______________
be unable to reproduce
Other insects
bees are responsible
would die out
for pollinating about 70%
Humans have nothing to eat and die out.
Listening & speaking: Summary
have fun
You must be kidding! Are you sure about ...
I don’t believe it! Check it out for yourself ...
It’s a fact! According to statistics ...
Don’t forget that …
Expressing doubt Responding to doubt
Complete the boxes with the expressions from the conversation.
Listening & speaking: Summary
Expressing doubt Responding to doubt
You must be kidding!
I don’t believe it!
Are you sure about ...
It’s a fact!
Don’t forget that…
Check it out for yourself... According to statistics...
Complete the boxes with the expressions from the conversation.
Listening & speaking: Pair work
Work in pairs. Talk about what would happen to the ecosystem if another species died out. Use the words and expressions in this section.
Ⅳ
Homework
Homework
1. Summarize the usage of It as an empty object
and do the relevant exercises.
2. Describe how a place you know has changed
using it as an empty object where appropriate.