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Unit4 lesson One Population Problems
Educational Objectives：
1. To master and use the past perfect tense.
2. Discuss population problems.
3. Express causes.
Teaching Objectives：
1. Practice Ss’ ability to communicate with others.
2. Enha
2、nce the listening by a video.
3. Create a chance for Ss to make dialogue.
Emotional requirements：
1. Raise the interest of learning English by encouraging and stimulating the students to participate in English activities.
2. Help students to describe a person.
Procedures.
I. Warming up
1. Sho
3、w a graph of population, let them talk about it freely.
2. Tell them something about the world’s population problems, repair for the text.
3. Show some questions, let them finish them in five minutes.
T: Let’s look at the graph, we can answer the five questions, can you finish them in five minute
4、s?
S: Yes, of course.
T: ok, I will check you later. Do it quickly.
T: Ok, let’s check the answers.
S: 1.It shows the population growth.
2.Yes, it is.
3.It’s 6.4 billion.
4.They are faced with the problem of overcrowding, population growth, aging population.
5.It should control the birthrate
5、
II. While-task activities
1. Teach the text.
i) T: We know the world population is growing very fast, do you know what’s the population of many countries? What’ s the population many years ago? let’s read the text, then fill in the blanks.
S: Read
Show the answers to them , let them check th
6、emselves.
ii) Do a pair work to ask and answer questions about the text.
2. Tell the past perfect tense.
1) Ask one of pair to read the sentences.
2) Answer the questions.
T: We can find the past perfect tense.
過去完成時的用法
一、構(gòu)成方法
由 had 加動詞的過去分詞構(gòu)成?！ ?
二、用法說明
■表示在過去某一時刻或某一動作之前已經(jīng)完成了的動作，即“過去的過
7、去”。如：
She said she had never been to Paris. 她說她從未去過巴黎。
When the police arrived, the thieves had run away. 警察到達時，小偷們早就跑了。
By the time he was twelve, Edison had begun to make a living by himself. 到了十二歲那年，愛迪生開始自己謀生。
注意：過去完成時是一種相對時態(tài)，一定要有一個作參照的過去時間或過去動作作比較，否則，就不能用過去完成時。但下列3種情況雖然有是先后發(fā)生的兩個過去動詞，卻同用一般過去時
8、：
1. 先后發(fā)生的一系列動作，但并不強調(diào)先后時，最后兩個動詞用then，and，but 等連接。如：
On Saturday afternoon, Mrs. Green went to the market, bought some bananas and visited her cousin. 星期下午，格林夫人去了市場，買了些香蕉，然后去看望了她的表姐。
2. 兩個動作是緊接著發(fā)生的，可用一般過去時。如：
When I heard the news, I was very excited. 我聽到那個消息時，非常高興。
3. 敘述歷史事實，可用一般過去時。如：
Our tea
9、cher told us that Columbus discovered America in 1492. 我們老師告訴我們哥倫布于1492年發(fā)現(xiàn)了美洲。
■表示從過去某一時刻開始一直延續(xù)到另一過去時刻的動作或狀態(tài)。跟現(xiàn)在完成時一樣，也常與 how long, for three days, before 等表示一段時間的狀語連用。如：
When Jack arrived he learned Mary had been away for almost an hour. 當(dāng)杰克到來時，他才了解到瑪麗已經(jīng)離開差不多一個小時了。
■表示未曾實現(xiàn)的希望或打算。表示希望或打算的動詞，如hope
10、, want, expect, think, suppose, plan, mean, intend等的過去完成時，后接不定式to do時，表示未曾實現(xiàn)的希望或打算，即“本來希望或打算做某事(但卻沒做) ”。如：
I had hoped to send him a Christmas card，but I forgot to do so. 我本來希望寄給他一張圣誕卡的，但我忘了寄了。
Do some exercises to consolidate the using.
3. T: Do you know the future problems ?
S: No,/Yes,….
T:
11、Ok, let’s talk about it by reading a passage. And then finish two tasks below.
III. Post-task activities
To make a short dialogue and ask some Ss to act it out using the knowledge they learned today.
IV. Homework
1. Recite the sentence patterns
2. Write a short essay “ Talk about the problem
12、s about population.”
板書設(shè)計：
Unit4 lesson One Population Problems
1.It shows the population growth.
2.Yes, it is.
3.It’s 6.4 billion.
4.They are faced with the problem of overcrowding, population growth, aging population.
5.It should control the birthrate.
過去完成時的用法
一、構(gòu)成方法
由 had 加動詞的過去分詞構(gòu)成。
二、用法說明
表示在過去某一時刻或某一動作之前已經(jīng)完成了的動作，即“過去的過去”。
教學(xué)反思：
通過本課教授，發(fā)現(xiàn)積極創(chuàng)設(shè)情境，會極大的激發(fā)學(xué)生學(xué)習(xí)欲望和積極性，本課我主要采用了任務(wù)型教學(xué)法，比單純教師講授更有效果，今后還會多多采用。
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【金識源】八年級英語下冊 Unit 4 Lesson 1 Population Problems教學(xué)設(shè)計1 上海新世紀(jì)版
