【正文】 你最好穿上我的外套。） ought to 在語(yǔ)氣上比 should 要強(qiáng)。 5） 推測(cè)的否定形式 ， 疑問(wèn)形式用 can39。t you answer my phone call? 為何不接我的電話？ Well, I must have been sleeping, so I didn39。t表示 禁止 。 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 比較 can 和 be able to 1） can/could 表示能力 ； 可能 （ 過(guò)去時(shí)用 could） , 只用于現(xiàn)在式和過(guò)去式 （ could） 。 唯一的 ‖ This is a unique work of art. It is a unique opportunity for you to succeed. . 詞組 : unique to sb. /sth. 僅與一個(gè)人或一個(gè)群體或一件事物有關(guān) You should concern the special difficulties unique to blind people when building a gym. . 2. property n. 特性 , 性質(zhì) (c) 財(cái)產(chǎn) (u) Many plants have medicinal （ 藥物的 ）properties. mon property公共財(cái)產(chǎn) The car is my property. 3. Water is actually quite simple, but the way the water molecule is formed gives water its unique properties. the way the water molecule 在這個(gè)定語(yǔ)從句中 the way 的前面省略了 that 或 in which I don‘t understand the way (that / in which) he worked out the problem. 4. that is: 在句中有兩個(gè)意思和用法 ① that is : which mean , 也可說(shuō)成 : that is to say ―即 , 就是 ‖ He is a local government administrator, that is to say a civil servant. ② that is : to be specific ―確切地 , 具體 地 ‖ She is a house wife –when she is not teaching English, that is. . 5. The nutrients in whatever falls into the ocean will quickly bee available to other living creatures. 1) a. whatever(=anything that)作為連接代詞引導(dǎo)名詞性從句 ， ―無(wú)論什么 ， 任何東西 ，一切事物 ‖， 語(yǔ)氣比 what強(qiáng)烈。 It can absorb a large amount of heat。 Asia, Africa, Europe, the North America, the South America, Antarctica, Oceania Step2. Warming up Use the water, the oil and the glass to do three experiments. Learn more about water‘s properties by doing some simple experiments and learn to describe an experiment. What property of water does each of the four experiments illustrate? What causes this phenomenon? What‘s this phenomenon related to? ① Experiment 1 shows how air pressure causes a piece of thick paper to cling to an upturned glass of water. ② Experiment 2 illustrates how substances with different density behave when placed in the same container. ③ Experiment 3 is an example of how water dissolves substances and objects. ④ Experiment 4 illustrates some of the differences between salt water and fresh water. Step3. Speaking 1. Prespeaking 1) Do you agree with the saying ―Without water, life would not exist. ‖ ? 2) So not only you and I agree with this opinion, but also the United Nations hold the same view. And that‘s why we have World Water Day. Q: Is there anyone who knows when it is? － Mar. 22 3) Brief background information about World Water Day: World Day for Water is established by the United Nations General Assembly39。 于是 ‖, 后面跟現(xiàn)在分詞短語(yǔ) , 充當(dāng)結(jié)果狀語(yǔ) . 分詞短語(yǔ)作結(jié)果狀語(yǔ)一般置于句末 ， 有時(shí)前面帶有 thus, hence, therefore等副詞 ， 表示一種 ―可見(jiàn)的 ‖―順理成章 ‖的自然結(jié)果。 c. 表示過(guò)去某時(shí)刻動(dòng)作時(shí)。此句意可從后半句推出。 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 。t leave here until five o39。 注意 ： could, might表示推測(cè)時(shí)不表示時(shí)態(tài) ， 其推測(cè)的程度不如 can, may。那時(shí)天很熱。 10 would rather表示 寧愿 would rather do would rather not do would rather… than… 寧愿 … 而不愿。 They should be there by now, I think. 現(xiàn)在他們?cè)摰侥莾毫恕? 3） ought to have done sth, should have done sth表示本應(yīng)該做某事 ， 而事實(shí)上并沒(méi)有做。例如 ： At this moment, our teacher must be correcting our exam papers. 這時(shí)，想必我們老師正在批改試卷。 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。 （ 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。 2）在否定句、疑問(wèn)句中表示推測(cè)或懷疑。 撰稿 , 投稿 Everyone should contribute what she or he can afford. His work has contributed to our understanding of this difficult subject. contribute sth to 投稿 She has contributed several poems to literary magazines. contribute to 增加某事物 , 添加到某事 物中 。 It keeps water temperature steady。 Unit 13The water pla 教學(xué)設(shè)計(jì) 1 Teaching goals: 1. Talk about water and the ocean 2. Practice making suggestions and expressing opinions 3. Review Modal Verbs 4. Write an explanation paragraph Teaching Plan: (Six Periods) 1st period: Warmingup and Speaking 2nd period: Listening 3rd period: Reading 4th period: Integrating Skills 5th period: Grammar 6th period: Exercises Period 1 Warming up amp。 Part2(Para2): chemical structure of waterH2O Part3(Para3): salinity the percentage of salt. Part4(Para4): Density Part5(Para5): heat capacity Part6(Para67) Ocean motion Step 3. Careful Reading Read the passage carefully and answer the following questions. 1. What are the properties of water? Water is polar. Water is liquid at room temperature. Water has a relatively high freezing point. Water has density 1, 000 kg/m3. Water has high heat capacity. … 2. What causes water to have such unique properties? － Its molecule form / chemical structure. 3. What is water molecule like? Chemical structure: two hydrogen atoms and one oxygen atom. Different parts of it: a slightly positive end and a slightly negative end, so it is polar. The function of it: it causes water to be able to dissolve both solids and gases, and that‘s why water can break down nutrients quickly. 4. Do pure water and salt water have the same chemical structure? Does pure water have salinity? Qs: 1) What‘s salinity? 2) What is sea / salt water? － A mixture of pure water, dissolved gases and solids. 3) How does salinity affect water? 4) How does it affect water‘s weight and freezing point? － The higher salinity water has, the heavier the water is. The higher salinity is, the lower the freezing point of water is. 5. Salinity also has something to do with the density of water. The higher salinity is, the higher density of water is. Qs: 1) What is density? 2) How is density measured? 3) Which is denser, water or oil? 4) What will happen when water and oil are in the same container? What does this phenomenon illustrate? － Oil floats on water. A less dense substance floats on a denser substance. 5) Does water in t