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1、UnitUnit 2 2 SavSaving ing thethe EarthEarthTopic 2 Topic 2 All these problems are very serious.All these problems are very serious.Earth Song mp4揭西县第一中学 陈伟婷soil pollutionair pollution light pollution noise pollution litter The wind is blowing strongly with lots of sand. We call it sandstorm.snd n.沙
2、,沙子 sndst:m n.沙尘暴Do you know how sandstorms come into being(形成形成)? Now please look at the pictures in 1c and number them.Number the pictures and then talk about them .415362 many trees forests gone People have cut down too many trees.cut down 砍倒砍倒 wash the earth awayA lot of earth has been washed aw
3、ay. Why?Because people have cut down too many trees.1.Trees also stop the wind (from) blowing the earth away. 2.They can also prevent the water (from) washing the earth away.prevent privent v.防止，预防防止，预防点拨：stop sb./sth. (from) doing sth. = prevent sb./sth.(from) doing sth. 阻止做某事链接：同义词组 keep sb./sth.
4、from doing sth. 阻止做某事(from可以省略可以省略)(from不可以省略不可以省略) change into 转换成，把变成 desert dezt n.沙漠The forest has changed into desert. sandstorms come into being Talk about how sandstorms come into being .many treesforests gonewash the earth awaychange into desertsandstorms come into beingListen to 1a, answer
5、the questions.What are they talking about?What causes this kind of bad weather?They are talking about sandstorms.People have cut down too many trees. A lot of rich land has changed into desert.（录音（录音p35-1a）Cutting down too many trees is harmful not only to human beings, but also to animals and plant
6、s.human being 人人Watch the cartoon and answer the question.What are trees functions?Trees can stop the wind from blowing the earth away.A lot of water can be saved by forests.Trees can also prevent the water from washing the earth away.A.B.C.35-1a.swf In order to protect the environment,we have built
7、 “The Great Green Wall”. Although we have built “The GreatGreen Wall”, we still need to work hard to protect the environment.although :lu conj.虽然，尽管虽然，尽管同义词组同义词组: though、 even if / though注意：although、though引导的从句不能与but、however同时出现在一个句子中，只能用其中一个。Although he was old, but he worked hard. Although he was
8、old, he worked hard.He was old, but he worked hard.在在1a中找到并划出下面的短语中找到并划出下面的短语1.刮大风刮大风 2.伴有很多沙尘伴有很多沙尘3.走在路上走在路上 4.刚才刚才5.砍伐太多的树木砍伐太多的树木 6.造成沙尘暴造成沙尘暴7.结果结果 8.大量富饶的土地大量富饶的土地9.变成沙漠变成沙漠 10.阻止大风刮走泥土阻止大风刮走泥土11.阻止流水冲走泥土阻止流水冲走泥土12.对人类有害对人类有害13.绿色长城绿色长城 14.需要努力工作需要努力工作1.刮大风刮大风 blow strongly 2.伴有很多沙尘伴有很多沙尘 with
9、 lots of sand3.走在街上走在街上 walk down the street = walk along/on the street 4.刚才刚才 just now =a moment ago5.砍伐太多的树木砍伐太多的树木cut down too many trees = cut too many trees down6.造成沙尘暴造成沙尘暴 cause/creat these sandstorms7.结果结果 as a result 8.大量富饶的土地大量富饶的土地 a lot of rich land9.变成沙漠变成沙漠 change into desert =turn int
10、o desert10.阻止大风刮走泥土阻止大风刮走泥土stop the wind from blowing the earth away11.阻止流水冲走泥土阻止流水冲走泥土prevent the water from washing the earth away12.对人类有害对人类有害 be harmful to human beings =do harm to human beings13.绿色长城绿色长城 The Great Green Wall 14.需要努力工作需要努力工作need to work hard1.What bad weather! = How bad the weat
11、her is!总结：What引导的感叹句What (a/an)+形容词+_+（S+V）！链接：How引导的感叹句a. How + _+（S+V）！常用于感叹句中的不可数名词有:food, news, work, weather, music，fun等形容词形容词 / 副词副词 名词名词练习：（一）用 “what”或“how”填空1） _ high （Wu Peng jumps）！2） _ an interesting film （it is）！3） _ bright （the sun is）! 4） _ well （he writes English）！5） _ useful work （th
12、ey have done）!WhatWhatHowHowHow2. I couldnt see anything , and my face hurt while I was walking down the street just now.点拨：notanything = _ 练习：The police found nothing in the room. = The police _find_inthe room.点拨：while引导的从句的谓语动词必须是 _ 。nothingdidntanything延续性的延续性的3. But what causes these sandstorms?
13、 在这个句子中，特殊疑问词作_，谓语动词用_数形式；特殊疑问词作主语时，本身就是陈述语序，因此改成间接引语时_不变。Can you tell me _?主语主语单单语序语序What causes these4.As a result, a lot of rich land has changed into desert.点拨点拨：change into（把变成）=练习练习：1)他们正在使沙漠变成农田。 They are _desert_ farmland.2)Could you change this article into English? 译：_changinginto你能把这篇文章翻译
14、成英语吗？你能把这篇文章翻译成英语吗？turn into5.a)Trees can also stop the wind (from) blowing the earth away. b)They can also prevent the water (from) washing the earth away.练习:大雨使我们无法外出。a. The heavy rain prevented us from going out yesterday.b._c._The heavy rain stopped us from going out yesterday.The heavy rain kep
15、t us from going out yesterday.6. And a lot of water can be savedby forests.本句话用了含有情态动词的被动语，结构：_同义句：Forests _ _ a lot of water.情态动词情态动词 + be + 过去分词过去分词can save7.Cutting down trees is harmful to human beings, animals and plants. 思考思考：cutting down trees是_在句中作_语，谓语用_数。练习：练习：1)散步是我的爱好。_ _my hobby.2)打乒乓球很
16、有意思。_ _ _great fun.3)阅读使人完美。_ _ a man _.动名词短语动名词短语主主单单 Walking is Playing Ping-pong is Reading makes perfect注意：cut down 是动副短语,代词作宾语时要放在_。如：树对我们是有用的,我们不应该砍到它们Trees are useful to us . We shouldnt _ _ . 链接: 切断、中断_ 切碎、剁碎_ 剪掉、戒掉_cutthem downcut offcut upcut out短语之间短语之间8.Although we have built “The Great
17、GreenWall”, we still need to work hard to protectthe environment.点拨：点拨：although 引导 状语从句，可以和 _互换，although 较正式，常放句首。 注意：注意：although 引导的从句不能与引导的从句不能与but / however一同连用，但常与一同连用，但常与still / yet连用。连用。练习：练习：( )_ my grandpa is old , _ he looks very strong and healthy.A. Although ; and B. Although ; butC. Alth
18、ough ; / D. Although ; orC让步让步thoughIf you are the tree in great danger,what do you want to tell people ? If you are the tree in great danger , what do you want to tell people ? sand snd n.沙，沙子 sandstorm sndst:m n.沙尘暴 cut down 砍倒 change into 转换成，把变成 desert dezt n.沙漠 desert dizt v.舍弃，遗弃 prevent prive
19、nt v.防止，预防 prevent.from 妨碍，防止，预防 human being 人 although :lu conj.虽然，尽管 What bad weather! I couldnt see anything , and my face hurt while I was walking down the street just now. But what causes these sandstorms? As a result, a lot of rich land has changed into desert. And a lot of water can be saved
20、by forests. Trees can also stop the wind from blowing the earth away. 在在1a中找到并划出下面的短语中找到并划出下面的短语1.刮大风刮大风 2.伴有很多沙尘伴有很多沙尘3.走在路上走在路上 4.刚才刚才5.砍伐太多的树木砍伐太多的树木 6.造成沙尘暴造成沙尘暴7.结果结果 8.大量富饶的土地大量富饶的土地9.变成沙漠变成沙漠 10.阻止大风刮走泥土阻止大风刮走泥土11.阻止流水冲走泥土阻止流水冲走泥土12.对人类有害对人类有害13.绿色长城绿色长城 14.需要努力工作需要努力工作 Trees are very useful
21、to us. They can help us p_ the wind from blowing the earth away and stop the s_ from moving towards the rich land. Trees also s_ water from running away. They can keep a great d_ of water. So we must stop people from c_ down too many trees. Otherwise a lot of rich land will change into d_, l_ only sand. We must get rid of (摆脱摆脱) this kind of bad b_. revent and ave ealutting esert eaving ehavior