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(共27张PPT)
北师大版选择性必修一
Unit 3 Conservation
Lesson 1 The Sixth Extinction
Grammar Defining and Non-defining clauses
Activity 1:
Review the endangered animals learnt in Lesson 1.
Review and activate
2. It usually lives in a place where there are a lot of bamboos.
1. It’s a bird that humans saved from extinction. It lives on an island off the coast of New Zealand.
3. It’s a kind of monkey whose fur is golden and long.
Activity 1:
Describe the endangered animal that you are going to introduce on the bulletin board in the English Corner.
Review and activate
Activity 1: Group work
Describe the endangered animal that you are going to introduce on the bulletin board in the English Corner.
Review and activate
You can begin your description like this:
1) It’s a/an animal/bird/fish which/that _________________.
2) It’s a/an animal/bird/fish whose _____________________.
3) It lives in a place where/which _______________________.
1) It’s a bird that humans saved from extinction.
2) It usually lives in a place where there are a lot of bamboos.
3) It’s a kind of monkey whose fur is golden and long.
Review and activate
Q:
What do these sentences have in common
What are relative clauses here used for
They all include a relative clause.
They are used here to give more detailed information about the nouns or pronouns in front of them.
Activity 2:
Zhu Jiawei, president of the English Club, has worked with Ouwen to finish a poster on pandas. Please improve their poster using proper relative clauses.
Application
Improve these expressions using a relative clause.
Relative clause:
1) To protect them from dying out, the Chinese government set up some nature reserves.
Pandas were protected in these nature reserves.
To protect them from dying out, the Chinese government set up some nature reserves where pandas were protected.
Application
Relative clause:
2) People destroyed the nature reserves. They were severely punished.
People who destroyed the nature reserves were severely punished.
Application
Two more sentences in the poster can be improved using a relative clause. Please have a try.
Analyze and Understand
Pandas belong to the bear family. Pandas are considered as one of the most valuable animals in the world.
Analyze and Understand
Pandas, which belong to the bear family, are considered as one of the most valuable animals in the world.
Q: Why commas (,) are used in this relative clause
Analyze and Understand
1) Pandas, which belong to the bear family, are considered as one of the most valuable animals in the world.
Compare
2) It is an animal which is black and white with two big ears.
It is an animal whose fur is golden and long.
Analyze and Understand
Compare
Summary 1： Defining clauses (限制性定语从句) are used to give necessary information to identify the persons/things.
限制性定语从句用于对所修饰的词起限制或修饰的作用，如果去掉此从句，主句的意思就不够完整或不明确。
2) It is an animal which is balck and white with two big ears.
It is an animal whose fur is golden and long.
Analyze and Understand
1) Pandas, which belong to the bear family, are considered as one of the most valuable animals in the world.
Compare
Summary 2：Non-defining clauses(非限制性定语从句) are used to give extra information about a person or a thing, which can be left out.
非限制性定语从句只对所修饰的词作附加说明，补充主句的信息，通常用逗号与主句断开，通常翻译为两个句子，即便去掉此从句，主句的意思仍然完整、清晰。
Analyze and Understand
1) I show great concern for the animal whose fur is golden .
2) The Giant panda _____________________________ is a symbol of successful conservation.
, which mainly feed on bamboos,
Use a relative clause to give more information about the nouns in blue.
which sits beside a rock
, which is black and white,
whose horns are very long
defining clause
non-defining clause
Activity 3: Practice
Ouwen wants to add more information for her poster.
Please help her choose the proper relative clauses.
1) a. Now many pandas are being protected in a nature reserve which is
called Wo Long.
b. Now many pandas are being protected in a nature reserve, which is
called Wo Long.
2) a. The Giant panda which has lived on the earth for at least 8 million
years is regarded as China's national treasure.
b. The Giant panda, which has lived on the earth for at least 8 million
years, is regarded as China's national treasure.
Application
Analyze and Understand
The giant panda has been removed from the list of endangered animals, which is really encouraging news.
Analyze and Understand
a) Pandas, which belong to the bear family, are
considered as one of the most valuable animals
in the world.
b) The giant panda has been removed from the list of endangered animals, which is really encouraging news.
Compare
Which of the non-defining clause above is used to ___
1) give extra information about a person or a thing, which can be left out. ___
2) give extra information about a whole sentence, which can be left out. ____
a
b
Summary 3：Non-defining clauses(非限制性定语从句) are also used to give extra information about a whole sentence, which can be left out.
非限制性定语从句也可用于修饰前面的整个主句，起补充、说明作用，即便去掉非限制性定语从句，主句的意思仍然完整、清晰。
Activity 4:
Jiajia found some information about the golden monkey. Help her translate it into English, using a proper relative clause if necessary.
1. 金丝猴主要分布在我国四川、贵州和云南，以浆果和竹笋为食。
2.适宜的栖息地正遭到破坏，这是金丝猴目前最大的威胁。
The golden monkeys, which feed on berries and bamboo shoots, mainly live in Si Chuan, Guizhou and Yunnan in China.
Their suitable habitats are being destroyed, which is the biggest threat for the golden monkeys.
Application
Activity 5:
Jing Kai found a profile about Chinese alligator on the Internet. Help him to organize his poster using proper relative clauses.
Application
Chinese alligator
Information: 1) live in fresh water
2) listed as national protected animals in 1972
Habitat: only found in China, mainly in eastern China
Population: less than 300 (wild population)
Why is it endangered 1) Hunted for its skin and meat
2) Natural habitats are being destroyed
What is being done 1) set up nature reserves;
2) punish hunters
Activity 6: As president of the English Club, Zhu Jiawei is inviting you to put your poster on endangered animals on the bulletin board. Please work in groups and make a poster.
Practice and consolidate
Practice and consolidate
Make a poster in groups.
Practice and consolidate
Group work presentation
The next topic of the school-wide public English speech in the English Corner is Endangered Animals. Search for more information about endangered animals and get ready for your speech. Try to use defining and non-defining relative clauses properly.
Assignment
Let’s take action to protect
the endangered animals &
the planet where we live.

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