牛津译林版八年级英语下册Unit 1 Welcome to the unit 示范公开课教案

Unit 1 Past and presentComic Pictures & Welcome to the unit本课时基本任务1.介绍本单元的主题：现在与过去2.学习不同时期有关交通工具的单词本课时必会单词：present, just, Light Rail, MTR, ferry, tram, since,本课时必会词组：an hour ago, be hungry, be kind, be so bad, want to do sth., play with sb., not…an y more本课时要了解的句型：1.It was in the bowl an hour ago.2.Because I was very hungry.3.You were kind.4.You always wanted to play with me.5.Have you seen my food?6.I’ve just eaten it.I. Lead-inTeacher says, ‘Hello, everybody! We haven’t seen each other f or a long time. Were you happy in winter holidays? Did you have a good time? What festival did you celebrate? Where did you go? What did you do? What did you eat? What food is your favourite?’II. Pre-taskTeacher says,‘My favourite food is chocolate. Because it smells nice and it tastes sweet and delicious, what’s more, it looks lovely and beautiful. Today I took a piece of chocolate here. I want to send it to someone clever. Oh, where is my chocolate? It was in my pocket an hour ago.’Teacher asks Ss,Have you seen my chocolate? --------No, I haven’t.Would you like to help me remember where it is?Ss guess Teacher saysMaybe you have put it in your bag. ---------No, I haven’t.Maybe you have put it in your book. ---------Yes, I have. How cleveryou are! I will send it to you.III. While-taskTask 1: Teacher asks,Do you still remember Hobo and Eddie?How are they this term?What are they talking about now?Let’s listen to the tape. (play the tape for the Ss to listen to the dialogue between Hobo and Eddie.) Task 2: Ask some questions about it:1. Where is Hobo’s food?2. Why did Eddie eat food?3. Is Hobo happy?4. What does Hobo think of Eddie?Task 3: Explain the important phrases and sentences in the dialogue.Phrasesan hour ago, be hungry, be kind, be so bad, want to do sth, play with sb., not…any more Sentences1. It was in the bowl an hour ago .2. Because I was very hungry.3. You were kind.4. You always wanted to play with me.5. Have you seen my food?6. I’ve just eaten it.7. You’ve eaten my food.Task 4: Work in pairs and drill the dialogue.Task 5: Ask some Ss to act the dialogue out, then do the exercise.Hobo’s food _______ in the _______ an hour ago. But it isn’t there now. Why? Eddie has just _______ it because he is ________. Hobo thinks Eddie has _______ and he is _______ bad now. He doesn’t w ant to _______ with Eddie any ________.Task 6: Teacher asks,Eddie and Hobo both think they have changed a lot. There are also many changes in our life. How did you come to school today?Do you know other different forms of transport？Task 7: Welcome to the unit.Show some pictures of the the different forms of transport.Ask the Ss to fill in the blanks with the correct names. Then check the answers.Task 8Read the following sentences and ask the students to guess which mode of transport you are describing.1. It has traveled across Victoria Harbour, between Hong Kong Island and Kowloon since1898. (ferry)2. It’s an easy way to get to the op of the peak. (peak tram)3.There are many of them. Each one has wheels and takes you to many places in and aroundHong Kong. (bus)4. It has provided transport service for people living in the north-west New Territories since1988. (light rail)5. It is the fastest way of traveling and was introduced to Hong Kong in 1925. (plane)6. Thousands of people travel to work on it every day. (underground)IV. Post-task1. Talk about the transport at different times in Hong Kong using the sentence:There has been … since ….2. Read the context of Part A and expand on it to create interest. Link it to personal experiences and talk about the usefulness, convenience and efficiency of different modes of travel. V. Homework1. Recite the sentences of the comic pictures.2. 翻译下列词组在碗中不再和……一起玩家乡学习更多的在过去的二十年中香港的变化一项历史计划上列词组的正确形式填空1) __________, the transportation has changed a lot in Nanjing.2) I did badly in my test. Now I ____ play computer games _____.3) Could you tell me some ________________?4) Lily is making ______ on the changes on her ___________?5) Jim likes to __ Ann. They have the same hobby of playing chess.6) Kitty likes traveling. She wants _________ the geography.7) Can you tell me where my food is? It’s _________.3. 你知道南京交通工具的演变过程吗？你能说出多少呢？第三—四课时Reading本课时基本任务1. 阅读关于九龙岛的变迁。

《Unit 1 Welcome to the unit》学案【学习目标】1. 识记北京不同时代的交通工具。

2. 谈论自己、家人和朋友过去和现在使用的不同交通工具。

3. 初步认识现在完成时。

教师个备或学生笔记【课前预习】短语翻译1.一小时前________________2.你见过我的食物吗_______________________3.我刚刚吃了它_______________4.步行去那儿______________/__________5.太多人和车辆_______________6.过去常常对我好__________________7.你已经变了____________________8.在过去_______________9.过去常常和我分享一切__________________10.现在_______________11.在不同的时代________________________12.他的过去和现在_______________13.等下一班公交_______________________14.打的环游这个城市________________ 15.乘大客车去北京______________/__________________/________________【学习过程】Step1: Lead ina. Revise：bus, taxi, train, plane, underground.(1) How do you go to school every day?(2) How do your parents go to work every day?(3)If I want to go to the USA, How can I get there?(4) How did you go to primary school? How did I go to school? (used to do...)b.guessing game1. It is a comfortable bus for carrying people over a long way.2. It has many stops to let people to get on and off, but doesn’t cost you much.3. It’s the fastest way of travelling to a place far away, but costs much. etc.Step2: Welcome to the unitA.Transport at different time in BeijingB.Liste n and answer: How did Millie’s father go to school when he was a student?Why didn’t he take a bus to school?How did Millie go to school ? Why?Step3: Comic stripListen and answer:1. What was in the bowl an hour ago?2. Why did Eddie eat Hobo’s food?Ask:Does Hobo think Eddie has changed? Why? (used to ....)Does Eddie think Hobo has changed? Why?Read and actStep 4 : Homework【当堂训练】一、根据句意和首字母提示完成下列句子：1.At p_______，we can fly to Seoul from Shanghai.2.We can't forget the poor life in the p_______．3.I've_______（刚刚）known about it. Sorry to hear that.4.He has changed. He u_______to be so kind to his wife.5.In big cities, people often go to work by u_______.It's fast and cheap.6.As t________ change, fashion changes, too.7.—Have you e_______ your lunch? ---Yes, I ate some rice and chicken.8.They have a_______finished their work, so they go home by c_________=on c_______.9.They arrived in Beijing on May Day. The n_______ afternoon they visited the Great Wall.10. Do you know the c_______ to Danyang in the past ten years?【课后提升】一、用所给词的正确形式填空：1. --Where’s my food? -- I ____________ just ____________ (eat) it.2.-- Look! Who ____________ (clean) the room ? -- Jim and his friends ______.3. -How often __________ Millie with her parents __________ (go) shopping? --Once a month.4. The meeting ________________ (begin) in half an ho ur.5. --Where ________ (be) Jim? --He _________(water) the flowers over there.6. --____________ you __________(see) my bike? -- No, I haven’t.7.They don’t want _____Maths because it’s too hard, but nothing can prevent me ____ it. (learn)8. There are some great ________in Nanjing. It __________ a lot.(change)9. He _____________ (not do) his homework on Fridays.10. They ___________ (watch) the football game at ten o’clock yesterday.11. You may let her _____________ (go) back home now.12. We enjoy _______________ (read) after class.13. It’s nice ____________ (meet) you here after a long time.14. In the past, she ___________ (not like) English, but now she ________.15.I don’t want to see the film, because I _____________(see) it already.16.You ______________(change).You________(be) kind. , but now you are so bad.17.We _______just_________(visit) the museum, it’s very interesting.18.--_______they __________the house at that moment? --Yes,they ______. (clean)19. Welcome to my party. Just help ___________(you) to the food and drink,children20. It is __________(healthy) to eat too much fat food.21. _________(luck), he passed the exam, but Lucy _______.22. It is ___________(polite)________(ask) a woman how old she is.23. Mum, How _______ you _______(go) to school when you ______(be) a student?24. _________(travel) by bus _______(seem) to be easy and fast.25.-Why____Tom _____(not drive) to work this morning?–Because his car_____(break) down.二、选择题：( ) 1.—It’s nice to see you again.Have you changed your job?--No._______ my cousin here.A.I’m going to visitB.I’m visitingC.I visitedD.I had visited( ) 2. We got here____________ half an hour ago.A. sinceB.／C. forD. in( ) 3. He walked _____ me and stopped to talk to me.A.passB.pastC.passedD.passing( ) 4.The building is a cinema now. It____________a supermarket.A. was used to beB. used to beC. is used to beingD. uses to be( ) 5. I am _______ my dictionary,but I can’t ________ it.A.look,findB.look for,findC.looking for,findD.looked,found( ) 6. –Mark speaks English well,but you _______ him. – Thank you.A.speak as badly asB.speak worse thanC.don’t speak as badly asD.speak much better than( ) 7. --Why _______ you join in the activity?---Since I was too busy.A. don’tB. notC. didD. didn’t( ) 8. In fact, _____ he is, ______ he feels.A. busy, happyB. busier, happierC. the busier, happierD. the busier, the happier ( ) 9.There is no ______ things on the moon.A. aliveB.livingC. lively D life( ) 10. What do you think ___ her _____? She is making a paper plane _______.A. make, sad, sadB. makes, sadly, sadC. makes, sad, sadly,D. make, sadly, sadly( ) 11. We were watching TV _____ he came in.A. whenB. whileC. howD. what( ) 12.一__________he __________at this school two years ago? 一一Yes，I think so.A. Did ; studyB. Has, studiedC. Was; studyD. Did; s tudied( ) 13.一China develops so fast.一That’s true. It____________a lot already.A. has changedB. changedC. will changeD. changes( ) 14.--_____ you ______ the film? –Yes, I _______it three months ago.A. Did,see,sawB. Have, seen, have seenC. Have ,seen, sawD. Did, see, have seen ( ) 15.Kate used to teach in a primary school, but now she ________.A. didn’tB. isn’tC. doesD. doesn’t三、翻译句子：1.我妈妈一小时前在家里．___________________________________________2.--你看见我的电脑了吗？-- 我没有_________________________________________3.格林先生每天乘公共汽车去上班．________________________________/____________________________________4.许多年前凯特曾经是一名护士，但现在不是了。

8B Unit1 Past and present8B Units1导学案参考答案Unit1第一课时：一、1.was 2.has eaten 3.to have 4.to play 5.is eating 6.took 7.rode8.will be二、1.would like , grows up 2.walks to school 3.goes to work by bus 4.flies to5.don’t want to any more第二课时：一、1.know about 2.get married 3.move out 4.water pollution 5.in the centreof6.feel lonely7.turn into8.from time to timeed to do 10.in some ways二、well has lived southern got married in the centre of children has changed a lotmarket stallsHas turned into to play cards pleasant shoe factory waste waterfish and plants polluted took action cleaner in some ways open space lonely第三课时：一、1. I don’t want to play with you any more.2.There used to be the home of birds.3.He live in Beijing since he moved here.4.In the past ,many people had no money to go to school.5.Nanjing has changed a lot in the past five years.6.Many friends have moved to other places ,so I feel lonely from time to time.7.I had an interview with my Chinese teacher this morning.8.It has bee more difficult to play chess with my old friends.二、1.Where have they gone ..2.How long has lived3.When was born4.you helping me第四课时：一、1.dishonest 2.unhappy 3.unlucky 4.impolite 5.unkind二、D C C B C A三、1.cheaper 2.healthiest 3.impossible 4.safely 5.well better第五课时：一、1.They haven’t read the book yet.Have they read the book yet? Yes, they have/ No , they haven’t1.How long has Daniel stayed in Shanghai?2. I have known him for ten years.3.Sandy has been in Beijing for half an hour.二、1. Have seen have did see2.lent hasn’t given 3.have been did visit第六课时：一、C C A A D B二、1. He has already finished homework.2.Have you ever been to Beijing?3.I have known Linda for 3years.4. I have just seen Lily.5.We haven’t heard from him for a long time.第七课时：一、1.is 2.do 3.will be 4.shall go 5.taught 6.has taught 7.has gone8.Have seen 9.have learned 10.will arrive二、1.How long have you known him?2.Has Jane finished her homework?3.I haven’t worked in this school for two years.4.Why hasn’t Jim finishedhis homework?5.when did you buy this watch?6.Who is the old man next to Lily?7.Which girl is my sister?8.How far is your home from your school?第八课时：一、1.advantages 2.reduce 3.changed 4.developments 5.service6.interview7.realizes 9.repair二、1.recently 2.unpleasant 3.impolite 4.have done 5.left6.southern7.polluted8.Has arrived arrived9.has eaten 10.have been第九课时：第十课时：一、1.as often as before 2. have an interview with sb ed to do sth 4.so big and modern5.in the north of二、1. was has lived 2.was made 3.Has arrived arrived 4.has eaten5.safely6.has been7.have been三、1.B 2.C 3.B 4.C 5.D 6.A四、1.Have you anything 2.doesn’t provide any longer 3.since ago ed to5.has been to。

8B U1 随堂练习Welcome to the unit随堂练习1. _______2. _______3. _______4. _______5._______ B．单项选择。

( )1. -_______ is my bike? It was under the tree five minutes ago.A. HowB. WhatC. WhereD. How long( )2. - Why don't you want to see the dolphin show?- Because I_______ it before.A. seeB. sawC. will seeD. have seen( )3. - Have you just_______ an apple? - Yes, I have.A. eatB. eatsC. ateD. eaten( )4. I_______ eat snacks before.A. am used toB. used toC. use toD. using to( )5. I was tired_______ I walked a long way.A. so .B. becauseC. butD. howeverC．汉译英。

1．你看到我的英语书了吗？_______ you _______my English book?2．我迟到是因为我起床太迟了。

I was late_______ I________ ______too late.3．我常和他合打一把伞。

I often _______one_______ _______him.4．你能告诉我北京在过去一百年中的变化吗？Can you tell me the_______ in Beijing_______ _______ _______ _______ years? 5．在英语课上我过去常说汉语，但现在我习惯于说英语了。

八年级英语下册同步课时练习题（牛津译林版）Unit 1 Past and present第1课时comic strip & Welcome to the unit一、完成句子1．他感到很担心，他似乎还没有习惯在公开场合演讲。

He feels worried. It seems that he ________ ________ ________ ________ speaking in public.2．我们学校这些年发生巨大的变化。

_______________________________________________________________________________ __ in our school.3．当地人过去住在旧房子里，但是现在，他们中大部分已经搬进了新大楼。

Local people__________________________,but now, most ofthem_________________________.4．我们应当习惯公交出行。

We should_______________________by public transport.5．过去，人们只能骑自行车或步行来往于集镇。

_________________, people_____________by bicycle or on foot.题组A 能力提升练二、完型填空In many big cities, there are usually more than one underground line（地铁线）. The fastest way ____6____ in a city is by subway. Do you know how to travel by subway? Here is some information ____7____ before you travel by subway. First, you should ____8____ the right line. If you don't, you will have to ____9____ and take another one. Second, you need some coins____10____ your ticket, because ____11____ the machines which sell tickets only accept coins. Coins can be changed next to the ticket machines. Or you can go to the ticket office ____12____ some. ____13____ you have a prepaid card, you can just go ahead. After you have bought the____14____ , you should wait for your subway outside the yellow line. You ____15____ walk too close to the yellow line. It's dangerous.6．A．traveling B．to travel C．traveled D．/7．A．to know B．to find C．to see D．to take 8．A．plan B．draw C．discuss D．choose 9．A．get up B．go down C．get off D．get on10．A．of B．to C．for D．in11．A．most of B．some of C．one of D．a bit of 12．A．to buy B．to get C．to borrow D．to change 13．A．Where B．If C．What D．Why 14．A．coin B．train C．everything D．ticket 15．A．should B．needn't C．must not D．must三、阅读单选AFor most people, the word “fashion” means “clothes”. So people may ask the question, “What clothes are in fashion?” And they use the adjective(形容词) “fashionable” in the same way, “She was wearing a fashionable color.” But of course there are fashions in many things, not only in clothes. There are fashions in holidays, in restaurants, in films and in books. There are even fashions in school subjects, jobs and languages.Fashions change as time goes. If you look at pictures of people or things from the past, you will see that fashions have always changed. An Englishman in 1750 looked different from his grandson in 1860. Today fashions change very quickly. Some of these are natural. We hear about things much more quickly than ones in the past. Newspapers, radios, telephones, televisions, and computers send information from one country to another in a few hours. New fashions mean that people will buy new things, so you see there is also money in fashion.16．From this passage we know that “fashion” means ________.A．clothes B．many thingsC．most of the popular things D．everything17．Today fashions change very quickly because ________.A．people read newspapers every dayB．radios send information from one country to anotherC．new things that people like are often shown on TVD．people quickly learn what is happening in the world18．From the passage, we know fashions change ________.A．as places change B．as people change C．as time goes D．as information goes 19．“There is also money in fashion” means ________.A．fashionable things are expensive B．money comes from fashionC．people like new things D．there are no fashions without money 20．According to the passage, which sentence is NOT true?A．Fashion just means clothes.B．There are fashions in many things.C．An Englishman in 1750 was not the same as his grandson in 1860.D．New fashions mean that people will buy new things.BOur school is No 1 Middle School. It is not big, and it has a short history, but I’m lucky that I am a student of this school.Ten years ago, there were not any teaching buildings and not a library in our school. The playground was so small that we could only play basketball there.Now great changes have taken place in our school in the past ten years. There are three modern teaching buildings and there four modern computer classrooms. We have computer studies every week. On the left side of the school stands a modern lab building. On the right side of the school there is also a modern building—the library. In the library there are 20 thousand books and magazines. We can go to the library to borrow books and magazines at any time. We have built a new playground. It is much bigger than before. We can play not only basketball but also footballand many other sports there. There are a lot of flowers, grasses and trees in and around our school. We usually take a walk or chat with our classmates after lunch and supper between the flowers and trees. We always feel very happy.In a word, our school is more and more beautiful and modern. We love our school.21．The school looks like ________.A．not big but modern and beautifulB．big, modern and beautifulC．very small but modern and beautifulD．not big but modern and beautiful with a long history22．Could the students borrow the books from the library ten years ago?________A．Yes, they could.B．It’s impossible because there is not library.C．I’m not sure.D．Certainly.23．There are ________ buildings in the school.A．four B．three C．seven D．five24．The students can borrow the library books ________.A．on weekdays B．on SaturdaysC．at weekends D．A and C25．We can find the students ________ after lunch in No 1 Middle School.A．in the reading roomB．in the dining roomC．between the trees and the flowersD．in the shop.题组B 培优拔尖练26．He used ________ in a town, so he ________ everything in the new town very soon.A．to live, got used to B．live, used toC．to living, got used to D．to live, used to27．Jack used to ________ shy but now he is used to ________ with others.A．be; talk B．be; talking C．being; talk D．being; talking 28．Miss Li used to ________ to work, but now she gets used to ________ to work. A．drive; ride B．drive; riding C．driving; ride D．driving; riding 29．—Have you finished your homework ________, Jane?—Yes, I've finished it ________.A．already; yet B．yet; already C．yet; yet D．already; already30．When you feel helpless and_________, just remember that you are not _________ in the world because your friends are around you.A．alone; alone B．alone; lonely C．lonely; alone D．lonely; lonely参考答案一、完成句子1．他感到很担心，他似乎还没有习惯在公开场合演讲。

Unit 1 Past and presentWelcome to the unit1. past and present 过去和现在2. in the bowl 在碗里3. an hour ago 一小时前4. —Have you seen my food? 你见过我的食物吗？—Yes, I’ve just eaten it. 是的，我刚把它吃了。

5. used to share food with me 过去常常和我分享食物6. be so kind to me 对我那么好7. transport at different times 不同时代的交通工具8. by bike/ bus/ underground/ car/ taxi/ coach/ train/ plane骑自行车/乘公交车/地铁/汽车/出租车/长途汽车/火车/飞机9. Why didn’t you take a bus? 你为什么不乘公交车呢？10. too many people 太多人11. It took a long time to wait for the next bus. 花费很长时间等到下一班公交车。

12. It’s easy and fast (to go to school by bus). (乘公交车去上学)既简便又快捷。

Reading1. I’ve lived here since I was born. 我自出生就住在这里。

2. move house 搬家3. in the northern part of town 在城镇的北部4. get married 结婚5. move two blocks away 搬离两个街区6. We’ve lived in this area since then. 从那时起我们就住在这个地区了。

7. over the years 在这几年中8. turn part of the town centre into a new park 将镇中心的部分变为一个新公园9. a steel factory 一个钢厂10. put the waste into the river 将废物投入河中11. realize the problem 意识到这个问题12. take action to improve the situation 采取措施改善情况13. in some ways 在某种程度上14. move away 搬离15. know little about… 对……知道很少know nothing about…对……一无所知16. It has become impossible for us to see each other as often as before.我们已经不可能像以前那样经常见到彼此了。

Unit 1 Past and present教案总课题8B Unit 1 Past and present 总课时8 第1 课时课题Welcome to the unit 课型New教学目标1 To introduce the present perfect tense generally.2 To introduce the different forms of transport at different times in Hong Kong.教学重难点1.To introduce the present perfect tense generally.2 To introduce the different forms of transport at different times in Hong Kong.学法指导task-centered approach教具准备课件教学步骤二次备课Step 1: Free talkIn the past, Hobo and Eddie weregood friends. But now somethinghappens between them. Do you wantto know what’s wrong with them?Step 2: PresentationRead the dialogue, and find out the answers to the followingquestions.1)What was in the bowl an hour ago?2) What did Eddie do?3) Why did he do that thing?4) Why does Hobo think Eddie has changed?Explaining the new tense :the present perfect tenseEg: 1) Have you seen my food?(see—saw—seen)2)I’ve (I have) eaten it.(eat—ate—eaten)3) We have not seen him for a long time ……4) How has he changed?Let Ss read the dialogue in pairs.Step 3: Presentation1. Show the pictures . Discuss them with the Ss.: What’s the use ofit?Where do you usually see it?Is it a special one? Why?Which transport do you like best?2. Write the correct names under the pictures.Step 4: PracticeFinish part B (Back to the past) & complete the timeline.作业设计1.背诵本课的单词与词组2.预习Reading，完成预习作业教学反思总课题8B Unit 1 Past and present 总课时8 第2课时课题Reading 1 课型New 教学目标1 To grasp some useful expressions2 To infer general meaning from title and context教学重难点The unders tanding of the reading学法指导Task-centered approach教具准备课件教学步骤二次备课Step 1 Free talk .Where is your hometown?Has it changed a lot?Can you tell us something about the changes to your hometown?As you know, I am a teacher now. But five years ago, I was ateacher, too. So I have worked here for 3 years. I think our schoolchanged a lot. Do you think so? Everything has changed a lot?Step2: Presentation.Have you been to Beijing? Now, look at some pictures of it. Witnessgreat changes to it over 100 years. Show pictures.Step 3 Reading A1. Would you like to listen to Mr Chen, Daniel’s grandpa? Play theta pe for Ss 2 times. Answer the following questions.How long has Mr Chen known Sunshine Town?Did Mr Chen live there all the time? Why?Does Mr Chen think the place changed a lot?What are the differences between the past and present?2.Check the answers if they can not answer.3. Explain some difficul t points.4. Ask Ss to read in pairs and try to act it out.Step4: Practice.1.Do the exercise on page 10 B1Match the words on the left with the meanings on the right.2. Finish off the exercises of partB2,3 on P.(T/F).S tep 5 Finish Part D on page 11作业设计1．背诵本课的单词与词组2．完成《课课练》上本课时的作业教学反思总课题8B Unit 1 Past and present总课时8 第 3 课时课题Reading 2课型New教学目标To grasp some useful expressions and understand the new tense-Present perfect tense;To retell the main idea of the text；教学重难点To get more detailed information about the changes to the town and understand the new tense-Present perfect tense.学法指导Task-centered approach教具准备课件教学步骤二次备课Step 1: Pre-checking.Translate the phrasesAsk some students to give us the answers and then correct;Ask themto read together.B.预习交流作业（见学案）小组核对-----集体校对-----质疑交流C.Further understanding the text.Ask and answer.Who is Mr Chen?(He is Daniel's grandpa who lived in Sunshine Town before.)What do you know about Mr Chen?(He got married in 1965.Then he and his wife moved to another flat inthe center of town. Lase Last year, they moved again. Now, he oftenmeets his friends in the park.He feels a bit lonely from time to time.)What was in Sunshine Town in the past?(There was some small restaurants,shops and market stalls. There wasalso a small post office and an old cinema.)How many people lived there in the past?(30,000people.)What is the town centre now?(It's a park. )What does Mr Chen do in the park?(He meets his friends to play cardsand chinese Chinese chess.)Why is there less water pollution than before?(Because thegovernment has took taken action to reduce the pollution. )Step2:PresentationA. Present perfect tense:①概念:动词结构：have/has+动词的过去分词基本用法：表示这个动作发生在不确定的过去时间并对现在有影响。