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1、Unit 2 Saving the Earth,Topic 2 All these problems are very serious.,Section B,Earth Song mp4,揭西县第一中学 陈伟婷,soil pollution,air pollution,light pollution,noise pollution,litter,The wind is blowing strongly with lots of sand. We call it sandstorm.,snd n.沙,沙子,sndst:m n.沙尘暴,Do you know how sandstorms come
2、 into being(形成)? Now please look at the pictures in 1c and number them.,Number the pictures and then talk about them .,( ),( ),( ),( ),( ),( ),4,1,5,3,6,2,many trees,forests gone,People have cut down too many trees.,cut down 砍倒,wash the earth away,A lot of earth has been washed away. Why?,Because pe
3、ople 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 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. from doing sth. 阻止做
4、某事,(from可以省略),(from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 .,cut down trees,many trees,forests gone,wash the earth away,change into desert,sandstorms come into being,Listen to 1a, answer the
5、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p35-1a）,Cutting down too many trees is harmful not only to human beings, but also to animals and plants
6、. human being 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 ha
7、ve built “The Great Green Wall”.,Although we have built “The Great Green Wall”, we still need to work hard to protect the environment. although :lu conj.虽然，尽管 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
8、he was old, he worked hard. He was old, but he worked hard.,在1a中找到并划出下面的短语 1.刮大风 2.伴有很多沙尘 3.走在路上 4.刚才 5.砍伐太多的树木 6.造成沙尘暴 7.结果 8.大量富饶的土地 9.变成沙漠 10.阻止大风刮走泥土 11.阻止流水冲走泥土12.对人类有害 13.绿色长城 14.需要努力工作,1.刮大风 blow strongly 2.伴有很多沙尘 with lots of sand 3.走在街上 walk down the street = walk along/on the street 4.刚才 j
9、ust now = a moment ago 5.砍伐太多的树木 cut down too many trees = cut too many trees down,6.造成沙尘暴 cause/creat these sandstorms 7.结果 as a result 8.大量富饶的土地 a lot of rich land 9.变成沙漠 change into desert = turn into desert,10.阻止大风刮走泥土 stop the wind from blowing the earth away 11.阻止流水冲走泥土 prevent the water from
10、washing the earth away 12.对人类有害 be harmful to human beings = do harm to human beings 13.绿色长城 The Great Green Wall 14.需要努力工作 need to work hard,What bad weather! = How bad the weather 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, mu
11、sic，fun等,形容词 / 副词,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 （they have done）!,What,What,How,How,How,2. I couldnt see anything , and my face hurt while I was walking down the street
12、 just now. 点拨：notanything = _ 练习： The police found nothing in the room. = The police _find_in the room. 点拨：while引导的从句的谓语动词必须是 _ 。,nothing,didnt,anything,延续性的,3. But what causes these sandstorms? 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,单,语序,What causes these,4.
13、As a result, a lot of rich land has changed into desert. 点拨： change into（把变成）= 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：_,changing,into,你能把这篇文章翻译成英语吗？,turn into,5.a)Trees can also stop the wind (from) blowing the earth away. b)They can also preve
14、nt the water (from) washing the earth away. 练习:大雨使我们无法外出。 The heavy rain prevented us from going out yesterday. b._ c._,The heavy rain stopped us from going out yesterday.,The heavy rain kept us from going out yesterday.,6. And a lot of water can be saved by forests. 本句话用了含有情态动词的被动语， 结构：_ 同义句： Fores
15、ts _ _ a lot of water.,情态动词 + be + 过去分词,can save,7.Cutting down trees is harmful to human beings, animals and plants. 思考：cutting down trees是_在句 中作_语，谓语用_数。 练习： 1)散步是我的爱好。 _ _my hobby. 2)打乒乓球很有意思。 _ _ _great fun. 3)阅读使人完美。 _ _ a man _.,动名词短语,主,单,Walking is,Playing Ping-pong is,Reading makes,perfect,注
16、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_,cut,them down,cut off,cut up,cut out,短语之间,8.Although we have built “The Great Green Wall”, we still need to work hard to protect the environment. 点拨：although 引导 状语从句，可以和 _互换，altho
17、ugh 较正式，常放句首。 注意：although 引导的从句不能与but / however 一同连用，但常与still / yet连用。 练习： ( )_ my grandpa is old , _ he looks very strong and healthy. A. Although ; and B. Although ; but C. Although ; / D. Although ; or,C,让步,though,If you are the tree in great danger,what do you want to tell people ?,If you are th
18、e 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 privent v.防止，预防 prevent.from 妨碍，防止，预防 human being 人 although :lu conj.虽然，尽管,Words and expressions,What bad weather! I couldn
19、t 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 by forests. Trees can also stop the wind from blowing the earth away.,Sentences,在1a中找到并划出下面的短语 1.
20、刮大风 2.伴有很多沙尘 3.走在路上 4.刚才 5.砍伐太多的树木 6.造成沙尘暴 7.结果 8.大量富饶的土地 9.变成沙漠 10.阻止大风刮走泥土 11.阻止流水冲走泥土12.对人类有害 13.绿色长城 14.需要努力工作,Trees are very useful 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) this kind of bad b_.,根据句意及首字母提示完成句子。,revent,and,ave,eal,utting,esert,eaving,ehavior,Goodbye!,