【正文】 What‘s the place called where river and the ocean meet? Step 2. Whilereading 1. Skimming 1). Find out the definition of estuary. (An estuary is the body of water where a river meets the ocean. Salt water from the ocean and fresh water from the river mix together in an estuary. This mixing of fresh and salt water creates a unique environment filled with life of all kinds a zone between the land and sea. ) 2). What functions of estuaries have been mentioned in the passage? (Great places for nature‘s young animals clean our water by absorbing nutrients and pollutants from water ing from inland sources。 3） 情態(tài)動詞沒有人稱，數(shù)的變化，即情態(tài)動詞第三人稱單數(shù)不加 s。 d. 用于句首表示條件。 3 比較 may和 might 1） 表示允許或請求；表示沒有把握的推測； may 放在句首，表示祝愿。 4 比較 have to和 must 1） 兩詞都是 39。 3） 否定結(jié)構(gòu)中 ： don39。 2） must表對現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測時， must 后面通常接系動詞be 的原形或行為動詞的進行式。 4） must表示對過去某時正發(fā)生的事情的推測 ， must 后面要接不定式的完成進行式。clock, he can39。 4） 情態(tài)動詞 +動詞的現(xiàn)在完成進行 時 ， 表示對過去正在發(fā)生事情的推測。 7 情態(tài)動詞 + have +過去分詞 1） may（ might） have + done sth, can （ could） have + done sth 表示過去 ， 推測過去時間里可能發(fā)生的事情。 He ought not to have thrown the old clothes away. 他不該把舊衣服扔了。 5） would like to have done sth表示本打算做某事 ， 但沒做。例如 ： It is pretty cold. You39。 還有 would sooner, had rather, had sooner都表示 寧愿 、 寧可 的意思。d better not play with the dog. 她最好不要玩耍那條狗。 It ought to be ready now. 想必現(xiàn)在準備好了吧。t have done sth表示本沒必要做某事，但做了。 She must have gone by bus. 肯定乘巴士去的。t表示。 2）情態(tài)動詞 +動詞現(xiàn)在進行時，表示對現(xiàn)在或?qū)碚谶M行的情況進行推測。 5） 否定推測用 can39。 He must stay there. 他必須呆在那 。t have to tell him about it. 你不一定要把此事告訴他。（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。例如 ： If that is the case, we may as well try. 如果情況確實如此 ， 我們不妨試一試。t. 可以 /不可以。例如： They will be able to tell you the news soon. 他很快就能告訴你消息了。 不可數(shù) ) I told them all the benefits of fresh air and exercise. He got a lot of benefit from the holiday. Your advice was of great benefit to me. + 4) for the benefit of 為了 … 的利益 be of benefit to sb. 對 … 有好處 2. 比較級 + than + any other + n. /all the other + n(pl). /anyone (anybody) else = 最高級 He is taller than any other student in his class. He is taller than all the other students in his class. He is taller than anyone else in his class. He is the tallest in his class. Paragraph Four 1. vary V. 變化 various adj. 各種不同的 variety n 變化 ， 多樣性 a variety of 種類繁多的 The girls e from a variety of different backgrounds. There are a variety of patterns for you to choose from. 2. Estuaries also contribute to the economy through tourism and fishing. contribute: v 捐助 , 捐贈 , 貢獻 。假定 。 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 the same ocean have the same density? － No. Denser water sinks and pushes less dense water to the surface. 6. That‘s why the ocean water will never stop moving. Qs: 1) What does ocean motion mean? 2) How does ocean motion work? － Denser water sinks and pushes less dense water to the surface. Ocean motion helps move nutrients around and adds energy to the marine ecosystems. 3) What causes ocean motion? － Changes in salinity and temperature. 7. The temperature of the ocean water always keeps steady, making the ocean a safe and fortable habitat. Do you know why? － Water has a relatively high heat capacity. Qs: 1) What is heat capacity? 2) What‘s the function of heat capacity? － It determines how a substance absorbs and releases heat。 It39。 Unit 13The water pla 教學(xué)設(shè)計 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。s part of every living anism on the pla。 It keeps water temperature steady。比方說 ‖ Let‘s say that you‘re right. Say you have an accident, who would look after you? Lets that any writer, say Dickens… 2. take advantage of sth. / sb. 充分利用某人 (某物 ) They took full advan