how life began on the earth语言点优秀课件

1、.1How Life Began on the EarthHow Life Began on the EarthLanguage studyLanguage studyUnit 4.2Why did many species(物种)like the dinosaurs die out?.3Air pollution ：smogsmog = smoke + fog.4Movie about the smog.5 lay-laid-laid-laying lay eggs 下蛋 lay 放, 把.放在.; 产卵原句再现1: They laid eggs too and existed on the

2、 earth for more than 140 million years.Farmers lay straws(秸秆)in the fields.eg. The hen laid seven eggs.Language study.6lie, lie , lay 的区别如下:Tips:Tips: lay (laid; laid; laying) 放置;产卵 lie (lay; lain; lying) 躺;位于 lie (lied; lied; lying) 说谎顺口溜: 规则的“说谎” （直接-d） 不规则的“躺” (完全不一致) 躺完就“下蛋” （lay） 下蛋不规则返回.7Tom w

3、ho_ on the grass _to me that the hen had _two eggs.layliedlaid返回.8 exist vi. 存在；生存 Without air, we cant exist even for one minute.没有空气，我们甚至连一分钟都生存不了。(1)There exist . 存在；有(2)existence n. 存在；生活come into existence=come into being产生；开始存在Language study返回.91Many problems are existing on your paper（改错）. Di

4、nosaurs once were existed on the earth（改错）There existed dinosaurs on the earth a long time ago.2翻译句子 很久以前地球上存在着恐龙(dinosaur)。Exercise There exist some factories in my hometown.我家乡有些工厂(factory)。exist_existed.10What many scientists believe is that the continued presence of water allowed the earth to di

5、ssolve harmful gases and acids into the oceans and seas. harmful adj. 有害的 harmless adj. 无害的 harm n./v. 损害，伤害，危害 be harmful to sb./sth.= do harm to sb. /sth.=do sb/sth harm 对有害原句再现2：.11The polluted air _our health.is harmful to /does harm to1.手机对家庭关系造成危害。Exercise The cell phones _our family relations

6、hip.are harmful to/do harm to 2. 被污染的空气对人的健康有害.12Others, called amphibians, were able to live on land as well as in the water. 另外一些叫作两栖动物,它们既能在活水里生存，也能 在陆地上生存。 A as well as B表示“(除B之外)A也; 既B又A”. 如: Im learning French as well as English. 我学英语之外还学法语。原句再现3：.13He as well as I _ (like) rock music.likesExe

7、rcise He grows flowers as well as vegetables.他既种菜也种花.就远原则.14This produced a chain reaction, which made it possible for life to develop. 该结构中，it作形式宾语，真正的宾语是后面的不 定式或that从句。常用于此结构的动词：make, think, believe, find, consider, feel等。 that 从句chain reaction 连锁反应2）Make it possible for life to develop. 使生命的发展成为可

8、能make it + adj./ n.+ to do sth. 使某人做某事 原句再现4：返回.15(2011天津高考)We feel _ our duty to make our country a better place.Ait BthisCthat Done解析：选 。考查代词。句意：我们认为把我们的国家建设得更好是我们的职责。根据句意可知，it 在句中作形式宾语，代替后面的不定式。直击高考A.161) 这场雨使我们走远路很困难。The rain _ long distances. 2) 他每天早晨六点起床，这已成为一种习惯。He_ get up at six every day.3)

9、 蒂娜明确表示她将离开这家公司。Tina _she would leave the company. made it difficult for us to walkmakes it a rule to made it clear thatExercise .17They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 阻止某人做某事 :prevent sb. (from) doing sth. stop s

10、b. (from) doing sth. keep sb. from doing sth. 注意：keep sb. from doing sth.中from不可省略,被动语态中,他们中的from都不可省。原句再现5： .18No one can_ this plan_ being carried out.1.人们被拦在了燃烧着的大楼外面(stopfrom)。2. 谁也不能阻止这个计划的实施。prevent fromPeople were stopped from entering the burning building.Exercise .19Compare the two sentence

11、s1.Mary kept the light burning all night.2.Mary kept the light from burning all night.拓展 keepdoing 持续做某事 keep.from doing 阻止干某事.20Challenge yourself原句再现：it was not clear whether the shape would last or not.（para.2） 1._ the shape would last or not is a difficult question to answer.3. The problem _ the

12、 shape would last or not puzzles us.2. We wonder _ the shape would last or not. 4. The problem is _ the shape would last or not. AWhetherwhetherwhetherwhetherBC DWhether四用法：A 同位语从句 B表语从句 C主语从句 D宾语从句.21 Translation：The air in my hometown1.There _(存在，有) a lot of factories in my hometown.3. They sent o

13、ut(释放) plenty of _(有害的) gases into the atmosphere.existharmful2. Many farmers _(放置)straws in the fields and burn them after harvesting.lay4.Many trees _(和) grass are destroyed for industrial land(工业用地).as well as5.这产生了一系列的反应。_.It produced a chain reactionChallenge yourself.226.雾霾让人们呼吸变得困难。The smog m

14、akes it _for people _.7. 雾霾阻止人们外出活动。The smog_us_going out and taking activities.difficult/hardto breatheprevents from8. 这一问题能否解决取决于当地政府是否及时采取措施(take measures )。_the problem can be solved _ _the local government takes measures _.Whether whether depends onin time Translation：The air in my hometownChal

15、lenge yourself.23Mini-writingTips:连句成篇, 必要时加适当的连词。The air in my hometown.24Show time There _(exist) a lot of factories in my hometown. Many farmers _(lay)straws in the fields and burn them after harvesting. They sent out(释放) plenty of _(harm) gases into the atmosphere. Many trees _(和) grass are dest

16、royed for industrial land(工业用地), _ produced a chain reaction.existharmfulas well aslaywhich.25 All this leads to the smog. The smog makes it _(hard)for people _ _ (breath). It prevents us from _ out and_activities. _the problem can be solved _(depend on) _the local government takes measures in time. I really hope that the air in