2021新版北师大版选择性必修第一册英语Unit 3 Conservation (8)-Grammar ppt课件.pptx

1、选择性必修一 Unit 3 Conservation (8) Relative Clauses Defining and Non-defining Clauses Grammar Review 1. Observe and identify the correctness of the sentences. This is the place I hid the key. This is the place where I hid the key. They are the people houses caught fire. They are the people whose houses

2、caught fire. 2. Read the sentences and discuss which word or words the clauses refer to. When we werent playing on the court which was next to our building, we were watching a game on TV. Pauls favourite player was Tyrone Bogues, a guy who played for the Charlotte Hornets. This is the place where I

3、lost my purse. Review 3. Review the definition of relative clause and relatives. What is a relative clause? Relative clause is a subordinate clause which specifies or gives information about a person or a thing we are talking about. What are relative pronouns and adverbs? who, which, that, whose, wh

4、om, as, when, where, why Review Observe and discuss 1. Read the sentences and discuss which word or words the clauses (in italics) refer to. Extinctions, where entire species are wiped out, are not unusual in our Earths history. This includes the third mass extinction, known as the “Great Dying,” wh

5、ich killed 90% to 96% of all species. A 2015 study by scientists who were based at Brown University and Duke University in the US, looked at how quickly species die out due to natural causes. If a sixth mass extinction occurs, scientists who have studied the issue believed that up to three quarters

6、of all species on Earth would die out. Observe and discuss We need to take steps to save endangered species, including setting up special areas where plants and animals can be protected. Observe and discuss 2. Look at the following examples and tell the differences between the sentences. . Extinctio

7、ns, where entire species are wiped out, are not unusual in our Earths history. If a sixth mass extinction occurs, scientists who have studied the issue believed that up to three quarters of all species on Earth would die out. Observe and discuss 3. Read the sentences and identify what kind of relati

8、ve clauses they are. The girl who is playing tennis is my friend. She still remembers the time when she noticed her car was missing. I dont agree with the proposal that you brought up in the meeting. (defining clauses) Observe and discuss 4. Read the sentences and identify what kind of relative clau

9、ses they are. The accident, which happened yesterday, has led to three deaths. The professor gave me a lot of advice, from which I benefited a lot. It is snowing heavily, which makes the children excited. (non-defining clauses) Observe and discuss 5. Read the sentences and discuss the differences in

10、 relative clauses. I like the book which / that was bought yesterday. I like the book, which was bought yesterday. He gave up the plan, which was a very good one. He gave up the plan which / that was a very good one. Conclusion: The relative pronoun “that” cant be used in non-defining clauses. Obser

11、ve and discuss 1. Summarize the categories of relative clauses and their features. Defining clauses: give information to identify the persons / objects Non-defining clauses: give extra information about a person or a thing, which can be left out Observe and summarize Practice 1. Underline the relati

12、ve clauses in the sentences and identify whether they are defining (D) or non-defining (ND). ( ) He went to a city where iron was produced in huge quantities. ( ) I met the famous professor in the hotel, where the meeting was held. D ND ( ) The bus which was full of tourists stopped near the Leaning

13、 Tower Pisa. ( ) Melissa lent me some money, which was very generous of her. ( ) The ground is covered with snow and ice, which makes driving very dangerous. D ND ND Practice I bought a car yesterday, cost me a lot. He was quickly taken to hospital, a doctor wanted to examine his legs. We will put o

14、ff the outing next week, we wont be so busy. which where when Practice 2. Fill in the blanks with the relative pronouns or adverbs. Theyve won their last three matches, I find a bit surprising actually. She had eight children, three of became soldiers. which whom Practice 2. Fill in the blanks with

15、the relative pronouns or adverbs. 3. Join each pair of sentences to form one sentence, using one of them as non-defining clauses with who, whom, whose, which, where or when. Amy is an actress. She is Jays friend. Amy, who is Jays friend, is an actress. Practice The doctors in that hospital tried the

16、ir best to save Amy. Amy spent two months in that hospital. The doctors at the hospital tried their best to save Amy, who spent about two months in that hospital. Practice Mike has decided to visit the Great Wall next month. His hobby is travelling. Mike, whose hobby is travelling, has decided to vi

17、sit the Great Wall next month. Practice Recently, I bought an ancient Chinese vase. The price of it was very reasonable. Recently, I bought an ancient Chinese vase, the price of which was very reasonable. Practice Express yourself Work in groups： Choose two or three environmental problems that are c

18、aused by human activity. Offer solutions. Try to use relative clauses when appropriate. For example: Our group choose global warming as the theme of our speech. Global warming has become one of the most serious problems in todays world. Potential threats which are associated with global warming incl

19、ude storms and sea level rises, etc. Costal cities will be drown to a great extent. Express yourself There are some ways to solve the problems. Firstly, we could live a low-carbon lifestyle, which is quite popular now. We could take vehicles that are friendly to environment such as subways and bikes

20、. Express yourself Secondly, importance should be attached to planting more trees, which will greatly alleviate the process of global warming. Last, the government should hold more activities whose themes are increasing peoples awareness on environmental protection. Express yourself 1. Have a group / pair discussion. Choose a new environmental problem which is not discussed in your group in the class. 2. Write down your solutions for the problem. Use relative clauses when appropriate. Homework Thank you！