高二英語人教版unit13教案

  Teaching Plan of Unit 13 The water planet Tasks which should be achieved in this unit: a. Achieve language skills and related knowledge about the topic of water and the ocean. b. Learn how to make suggestions and how to express opinions.   The water is being used to /for….   We should/ could….   If we …, we can ….   It would be better to … c. Vocabulary in this unit:   benefit, disadvantage, range, available, pure, mass, float, absorb, stable, bottom; d. Useful expressions:  benefit from, range from … to…., all the way, be made up of, that is, freezing point, break down, mix with, be measured in…, take advantage of…, keep … steady, manage to do. e. Grammar:   Review Modal Verbs. 情態(tài)動(dòng)詞can, could, may, might, will, would, shall, should, must, can’t 等的用法。   1) can /could Jin can speak English well. (ability) Could you please show me the way to Beihai Park? (request)   2) may /might May we see the awards for the teams? (permission; request) She might give you some new clothing. (possibility)   3) will /would   The Spring Festival is the most fun. The whole family will come for dinner. (promise; agreement)   Often he would dress up like a rich man. (past habit; custom)   4) shall /should   The harvest festival begins on Saturday. We shall be there with our friends. (promise; agreement) You should arrive at the airport two hours before he goes. (advice) 5) must /can’t Wang Feng wins an award every year. He must be very strong (speculation)   You must be joking. That can’t be true. (guessing) Teaching procedure: Period 1. Contents: Warming up & reading comprehension Step 1.Warming up Aim: Make students get to know something about water. Step 2. Pre-reading 1.Show some pictures of making electricity, irritating in agriculture, transport by ships, etc,. 2. group work: How is the water being used? Step 3. While-reading 1.Scanning: Ss read scan the bold words in the passage and understand the structure of the passage. How many parts are there in the passage? 2.Ss read and get the main ideas of each part. Part 1(para1):  the properties of water; Part2(Para2):  chemical structure of water---H2O Part3(Para3):  salinity----- the percentage of salt. Part4(Para4):  Density Part5(Para5):  heat capacity Part6(Para6-7) Ocean motion Step 4. After-reading   Finish the post-reading Ex on P21. Step 5. Assignment 1. surf the internet and get more information about water and ocean using search engines like yahoo or baidu. ( or just input the key words like Jules Verne into the address column of IE) 2. discussion: What will you prepare for writing an explanation of corals? After discussion, work out an outline. Period 2. Contents: difficulties in the passage. Step 1. Warming up   Ask some Ss to present their homework. Step 2. Learning about the language:   Play the tape for students to follow.  Teacher explain some language points in the text on page 19--20. 1. Who benefits from using water in this way? Benefit…from/ by… This song reminds me of France. Remind me to answer the letter. I reminded her that the book would cost her much.   2. Life in the oceans ranges from the tiniest plankton all the way to giant like sharks and whales. Range from… to…/ range between …. And…. 意為“從。。。。到。。。不等；在一定的范圍內(nèi)變化”，例如： Temperatures here range from 10 to 30 degrees centigrade. Prices range between ￡7 and ￡10. His interests ranged from chess to canoeing. 3. The two hydrogen atoms form a polar molecule, that is, one with a slightly positive end and one with a slightly negative end. That is 用作插入8，意為“那就是，即” My birthday is a week later, that is, March 1st. John is a New Yorker, that is , he lives in New York. 4. The nutrients in whatever falls into the ocean will quickly become available to other living creatures. Whatever 引導(dǎo)名詞性從句作賓語。 Tell me whatever is troubling you. She is always succeeds in whatever she tries. 5. Marine animals and plants take advantage of the density of water. Take advantage of  “利用，欺騙” Taking advantage of his friends, Mr. Li was scolded. He always takes advantage of mistakes made by others. Step 3. Practice Ss finish on page 14 by themselves and then check the answers. Step 4. Assignment 1. Learn the useful expressions by heart. 2. Finish  Ex1 –3 on page 96-97 on WB 3. read the whole passage aloud. Period 3. Contents: Grammar; talking and speaking Step 1. Revision  Check the answers of  Ex 1 – 3 on page 96-97. Step 2. Review Modal Verbs. 1 情態(tài)動(dòng)詞的語法特征 　1） 情態(tài)動(dòng)詞不能表示正在發(fā)生或已經(jīng)發(fā)生的事情，只表示期待或估計(jì)某事的發(fā)生。 　2） 情態(tài)動(dòng)詞除ought 和have 外，后面只能接不帶to 的不定式。 　3） 情態(tài)動(dòng)詞沒有人稱，數(shù)的變化，即情態(tài)動(dòng)詞第三人稱單數(shù)不加-s。 　4） 情態(tài)動(dòng)詞沒有非謂語形式，即沒有不定式，分詞，等形式。 　 2 比較can 和be able to 1）can/could 表示能力；可能 （過去時(shí)用could）, 只用于現(xiàn)在式和過去式（could）。be able to可以用于各種時(shí)態(tài)。例如： 　 They will be able to tell you the news soon. 他很快就能告訴你消息了。 2）只用be able to的情況： 　 a. 位于助動(dòng)詞后。 　 b. 情態(tài)動(dòng)詞后。 　 c. 表示過去某時(shí)刻動(dòng)作時(shí)。 　 d. 用于句首表示條件。 　 e. 表示成功地做了某事時(shí)，用was/were able to，不能用could。例如： He was able to flee Europe before the war broke out. = He managed to flee Europe before the war broke out. 他在戰(zhàn)爭(zhēng)爆發(fā)之前逃離歐洲。 注意：could有時(shí)不表示時(shí)態(tài) 1）提出委婉的請(qǐng)求，（注意在回答中不可用could）。例如： 　　 --- Could I have the television on? 我能看電視嗎？ 　　 --- Yes, you can. / No, you cant. 可以/不可以。 2）在否定句、疑問句中表示推測(cè)或懷疑。例如： 　　 He couldnt be a bad man. 他不大可能是壞人。　 3 比較may和might 1） 表示允許或請(qǐng)求；表示沒有把握的推測(cè)；may 放在句首，表示祝愿。例如： 　　May God bless you! 愿上帝保佑你！ 　　He might be at home. 他可能在家。 注意：might 表示推測(cè)時(shí)，不表示時(shí)態(tài)，只是可能性比may 小。 2） 成語：may/might as well，后面接不帶to 的不定式，意為不妨。例如： 　　　If that is the case, we may as well try.如果情況確實(shí)如此，我們不妨試一試。 典型例題 　  Peter ___come with us tonight, but he isnt very sure yet.  A. must　　 B. may　  C. can　  D. will 答案B. 表可能性只能用may。此句意可從后半句推出。 4 比較have to和must  1） 兩詞都是必須的意思，have to 表示客觀的需要，must 表示說話人主觀上的看法，既主觀上的必要。例如： My brother was very ill, so I had to call the doctor in the middle of the night.　 弟弟病得很厲害，我只得半夜里把醫(yī)生請(qǐng)來。（客觀上需要做這件事） 　　He said that they must work hard. 他說他們必須努力工作。（主觀上要做這件事） 2）　have to有人稱、數(shù)、時(shí)態(tài)的變化，而must只有一種形式。但must 可用于間接引語中表示過去的必要或義務(wù)。例如： He had to look after his sister yesterday. 他昨晚只得照顧他姐姐。 3） 否定結(jié)構(gòu)中：dont have to表示不必，mustnt表示禁止。例如： 　　 You dont have to tell him about it.　你不一定要把此事告訴他。 　　 You mustnt tell him about it.　　　　你不得把這件事告訴他。 5 must表示推測(cè) 　1） must用在肯定句中表示較有把握的推測(cè)，意為一定。 　2） must表對(duì)現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測(cè)時(shí)，must 后面通常接系動(dòng)詞be 的原形或行為動(dòng)詞的進(jìn)行式。例如： 　　　You have worked hard all day. You must be tired. 你辛苦干一整天，一定累了。（對(duì)現(xiàn)在情況的推測(cè)判斷） 　　　He must be working in his office. 他一定在辦公室工作呢。 　  比較：He must be staying there. 他現(xiàn)在肯定在那里。 　　　　　　He must stay there. 他必須呆在那。 　3） must 表示對(duì)已發(fā)生的事情的推測(cè)時(shí)，must 要接完成式。例如： 　　 I didnt hear the phone. I must have been asleep.　我剛才沒有聽到電話，我想必是睡著了。 　4） must表示對(duì)過去某時(shí)正發(fā)生的事情的推測(cè)，must 后面要接不定式的完成進(jìn)行式。例如： 　　---Why didnt you answer my phone call? 為何不接我的電話？ 　　---Well, I must have been sleeping, so I didnt hear it.唉，肯定在睡覺，所以沒有聽見。 　5） 否定推測(cè)用cant。例如： 　　 If Tom didnt leave here until five oclock, he cant be home yet.　如果湯姆

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