人教版九年级英语下册 Unit13第3课时 教学课件PPT初三公开课

1、Unit 13 Were trying to save the earth!Section A Grammar Focus-4c初中英语 九年级下册 RJNew words: afford, reusable, transportationExpressions: take part in, turn off, pay for, take actionGrammar: 能够正确区分和使用以下语法结构：现 在进行时、现在完成时、被动语态、情 态动词、used to等。Learning goalsWatch the video and pay attention to the grammar of

2、 sentences.Warming upsimple past tenseIt was a lovely fresh spring in the meadow.You found me easily.present progressive tenseWhat are you looking at?They are dancing through spring flowers.present perfect tenseLittle Green Worm has grown.I havent seen one quite like this before.You must be the best

3、 finder.I might be.modal verbsLittle Green Worm must have been really hungry.I cant see anything.modal verbsWere trying to save the earth.Present progressiveThe river used to be so clean.used toThe air is badly polluted.Passive voiceNo scientific studies have shown that shark fins are good for healt

4、h.Present perfectWe should help save the sharks.Modal verbsRead the following sentences and grammar items.Grammar FocusDivide the whole class into 4 groups, each group discusses one grammar item based on some questions and sentences, then sum it up.Group 1：时态 （现在进行 时，现在完成时）Group 2：语态 （被动语态）Group 3：情

5、态动词 Group 4：used toQuestions and sentencesQuestions and sentencesQuestions and sentencesQuestions and sentences点击文本框跳转到本组 需要回答的问题和能帮 助总结语法的例句。Group 1现在进行时：什么时候使用现在进行时？现在进行时的标志性词语有哪些？ 现在分词的构成规则有哪些？现在完成时：现在完成时态的用法有哪些？现在完成时态的结构是什么？现在完成时态的标志性词汇有哪些？ 过去分词的构成规则有哪些？Example sentences现在进行时 Now people are taki

6、ng action to save wild animals. Lets join them. Look! Kenny is swimming happily in the pool. Listen to me carefully please. I am talking about something very important. Be quiet, please. The baby is sleeping.现在完成时返回 He has kept this book for over two months. Please ask him to return it soon. We have

7、 lived here since my little sister was born. I like the people here. He has already tried this to solve the problem, but it didnt work.Group 2主动语态和被动语态有什么区别？被动语态的构成是什么？一般现在时、 一般过去时、一般将来时和情态动词 的被动语态的结构分别是什么？ Photos and experiences are shared on the microblog. The video was sent out quickly and was se

8、en by many schoolmates. In the future, robots will be used by more and more people.Example sentences返回Group 3情态动词有无人称和数的变化？情态动词后接动词的什么形式？你知道的情态动词有哪些？各表示什么意思？ Ken can climb up trees like a koala. Tracy could ride a bicycle when she was five years old. You mustnt play with fire. It is dangerous. Its r

9、aining outside, so I have to take an umbrella with me. Would you please do me a favor? Put the map up on the wall please. As a student, we should obey the school rules. The light is on in the office. Someone may be there.Example sentences返回Group 4used to表示什么意思？后接什么？used to句型的否定句和一般疑问句的形式是什么？used to和

10、be used to的区别是什么？ Example sentences James used to wake up late, but now he gets up very early. Did Cherry use to live in Shanghai when she was a child?现在进行时现在 进行 时基本 结构基本 用法be (am/is/are) + 动词-ing表示现在正在进行或发生的动作。表示现阶段或当前一段时间之内 正在进行的动作。标志 now、look、listen、these days等 词动词-ing形式的构成一般情况下，在动词词尾后加-ing。 如：go

11、 going。以不发音的e结尾的动词，去掉e加-ing。如：have having。以重读闭音节结尾的动词，末尾只有一个辅音字母， 双写这个辅音字母，再加-ing。如：run running。现在 完成 时结构基本用法标志词现在完成时基本 have/has + 过去分词表示过去发生或已经完成的动 作对现在造成的影响或结果。从过去某一时间开始并一直持续到 现在且还有可能持续下去的动作。already、yet、ever、never、for +时 间段、since +时间点、so far、in the last/past.years等过去分词的构成一般情况下，在动词后加-ed。如: work wor

12、ked。在以e结尾的动词后只加-d。如: close closed。以辅音字母加y结尾的动词，应将y改为i再加-ed。如: study studied。以重读闭音节结尾的动词，要双写末尾的辅音字母 再加-ed。如: stop stopped。过去分词的构成e.不规则动词的过去分词:AAA型 AAB型 ABA型 ABB型 ABC型put beat become get beginput beat became got beganput beaten becomegot/gotten begun练一练用括号中所给动词的正确形式填空。The girls _a_re d_a_n_c_i_n_g_ (d

13、ance) in the classroom now.Its 5 oclock now. Mike i_s _h_a_v_i_n_g (have) dinner. H_a_v_eyou ever been(be) to the US? Yes, twice.4.I _h_a_v_e li_v_e_d_ (live) here since 1999.主动语态和被动语态的区别被动语态主动语态表示主语是动作的执行者。被动语态表示主语 是动作的承受者，即行为动作的对象。I cleaned my room. My room was cleaned by me.I saw him cross the ro

14、ad and enter the shop. He was seen to cross the road and enter the shop.在含有使役动词 (如：make) 或感官动词 (see、watch、 notice、hear等) 的主动语态的句子中，这些词后常跟 省略to的动词不定式，但是改为被动语态时则要把省 去的to还原。被动语态的构成被动语态的基本结构：助动词be + 及物动词的过去分词 一般现在时的被动语态：am/is/are + 过去分词一般过去时的被动语态：was/were + 过去分词一般将来时的被动语态：will be/is going to be + 过去分词 含

15、情态动词的被动语态：情态动词 + be + 过去分词练一练用括号中所给动词的正确形式填空。1. Do you often clean your classroom? Yes. Our classroom is_c_l_e_a_n_e_d(clean) every day.2. Did you go to Jacks birthday party? No, I w_a_s_n_t_inv_it_e_d. (invite)3. A new highway in my hometown will be built(build) next month.情态动词情态动词一般没有人称和数的变化。情态动词后

16、接动词原形。常用的情态动词有：can/could、may/might、must/have to、should/ought to、would、need等。练一练根据题意选择最适合的情态动词。1. Ayou pass me a pen? Idlike to write down the phone number. Sure. Here it is.A. CanB. NeedC. MightD. Must2. You Cworry about me. Its nothing serious.A. cantB. mustntC. needntD. wont3. May I go to the cine

17、ma, Mom? Certainly, but you Cbe back by 11 oclock.A. canB. mayC. mustD. need4. Excuse me. Is this the right way to the Summer Palace? Sorry, Im not sure. But it Abe.A. mightB. mustntC. cantD. must5. The man in the office Cbe Mr. Black, because he went home just now.A. mustntB. may notC. cantD. needn

18、tused toused to意为“过去常常做某事”，后接动词原形。 used to句型的否定句形式：didnt use to.used to句型的一般疑问句形式：Did + 主语 + use to.? used to do表示过去常常做某事，而现在往往不做了； be used to doing表示习惯于做某事。Shewith friends on weekends.2. 他习惯于每天晚上睡得很晚。Heat night.u_s_e_d to h_a_n_g o_u_t练一练根据汉语意思补全句子。1. 她过去常常周末和朋友闲逛。is u_s_e_d_t_o_s_t_a_y_in_g u_pJoe

19、: _Ha_v_e_ you ever ta_k_e_n(take) part in an environmental project?Ken: Yes, I have. I _h_e_l_p_e_d_ (help) with a Clean-Up Day last year. It was _c_o_n_s_id_e_r_e_d_ (consider) the biggestclean-up project this city h_a_dever h_a_d(have).Joe: How many people to_o_k(take) part?Presentation4a Fill in

20、 the blanks with the correct forms of the verbs in brackets.Ken: I th_i_n_k(think) more than 1,000 people_c_a_me_(come) to help out.Joe: Thats fantastic! I guess everyone in this city is_t_ry_i_n_g_ (try) to improve the environment.Ken: Yes, we cant afford to w_a_i_t (wait) any longer to take action

21、!Language points1. Have you ever taken part in an environmental project?(教材P100 4a) take part in参加take part in多指参加会议或集体性的工作或活动，且参 加者在其中发挥一定的作用。Li Lanjuan headed for Wuhan and took an active part inthe battle.Language points2. Yes, we cant afford to wait any longer to take action! (教材P100 4a)afford /

22、f(r)d / v. 承担得起（后果）；买得起afford作动词，常用在can、could、be able to等之后。afford sth.“买得起某物”；afford to do sth.“负担得 起做某事”。I cant afford the new TV.I hope I can afford to buy a big house one day.with small things. For example, youinstead of plastic bags.can would could have to should must may/ might4b Fill in the b

23、lanks with the appropriate modal verbs from the box.People _m_a_y_/_m_i_g_h_t think that bigthings s_h_o_u_ld_/_h_a_v_e_t_o_/mu_s_tbe done to save the earth. Many forget that saving the earth begins_c_an_/_c_o_u_ld_/_s_h_o_u_ld_ save electricity by turning off the lights when you leave a room. You c

24、a_n_/_c_o_u_ld_/_s_h_o_u_ld_ also use reusable bagsadj. 可重复使用的； 可再次使用的关掉I think its a great idea that you now _h_a_v_e_t_o_ pay for付费；付出代价plastic bags in some stores. And instead of driving toschool or work, you _c_a_n_/c_o_u_l_d_/s_h_o_u_l_d_ ride your bike or walk. If its far, you c_an_/_c_o_u_ldt

25、ake the bus. All these small things c_a_n_/c_o_u_l_d_ add up and become big thingsthat _w_o_u_l_d_/c_a_n_/_c_o_u_ld_ improve the environment. Lets take action now!采取行动4c Make a list of things that people can do to help the environment and discuss your list with your partner.use public transportation

26、I think that everyone should use public transportation.I disagree. Its difficult for parents with young children to use public transportation.n. 运输业；交通运输A. explainsC. is explainingB. explainedD. has explained单项选择1.(2021 重庆中考A卷) Listen! Our science teacher Cthe use of the robot.ExercisesA. neednt; ma

27、yC. neednt; needB. mustnt; mayD. mustnt; must2.(2021 安徽中考) Our computer is working again! Yes. Our IT teacher Ait. It took him about an hour.A. has fixedB. will fixC. is fixingD. was fixing3.(2021 铜仁中考) Must I wash my clothes at once, Mom? No, you A. You wash them before 5:00 p.m.4.(2021 泸州中考) “Im s

28、till working because Im still capable and hope to guide more young people,” said Wu Mengchao when he C .A. is interviewedB. is interviewingC. was interviewedD. was interviewing5.(2021 天津中考) Where is Mum? In the living room. She Ca book at the moment.A. was readingB. will readC. is readingD. has read6