（新人教版）高中英语必修三《Unit4Astronomy the science of the stars》精品教案.doc

（新人教版）高中英语必修三unit4astronomy the science of the stars精品教案teaching aims:1. enable the students to learn the usage of key words and phrases and find the rules of the subject clause2. get the students to cultivate the awareness of protecting the earthteaching important/difficult points: the subject clauseteaching methods:help the students practice learning about language, using a co-operative method.teaching aids: a multiple-media computer & a blackboard teaching procedures:step i review the important phrases in the text.1.向四面八方_ 2.及时，终于_ 3.冷却；平静下来_ 4.与不同_ 5. 依赖；决定于_ 6. (除 . 之外)也，又 _ 7.成长为，渐成，变为 _ 8.下蛋_ 9.产生，分娩_ 10.轮到某人，接着_ 11. 阻止_ 12.作为 . 的结果，由于_step ii.language points:1. it exploded loudly with fire and rock they were in time to produce the water vapour,.in time: sooner or later; 迟早；最后。 即学即练translation: i believe that the 35 trapped coal miners will be found in time._in time : not late 及时；不迟即学即练她来得及赶上最后一班汽车。 she will _ 拓展: match the parts of the phrases about “time” belowon time 曾经 in no time 从前 at a time 不时地 at one time 按时;准时 once upon a time 立刻,马上from time to time 每次;一次2. others, called amphibians, were able to live on land as well as in the water.as well as “(除 . 之外)也，又”,可连接并列的单词或短语 eg: mary as well as her parents _.（喜欢听音乐）拓展：as well相当于too，一般放在句末。eg: he is a worker，and _.（也是一位诗人）辨析：as well as相当于not onlybut also，但两者在用法上有不同not onlybut also侧重后者，as well as则着重前者，即a as well as b= not only b but also a。即学即练mr. brown has experience as well as knowledge. =mr. brown_布郎先生既有知识又有经验。3.they produced young generally by laying eggs.fill in the table:动词 过去式过去分词现在分词意义lielain躺，位于lieliedlyinglaylaid搁，放，下蛋巧记口诀：规则撒谎，不规则躺：躺过下蛋，下蛋不规则。即学即练he _ in bed and _to me that his cow _ an egg. a. laid; laid; laid b. lay; lay; lain c. lied; laid; lain d. lay; lied; laid4. , which prevents heat from escaping from the earth into space.prevent (from) doing 阻止，制止辨析prevent from、 keep from stop from注意：prevent和stop 后面的介词from可以省略。但是在被动语态中，from不可省略。而keep sb. from doing sth. 中的from，无论在主动语态还是被动语态中均不可省略。即学即练 we must prevent the river from_.a. having polluted b. being polluting c. being polluted d. to polluted translation: 政府正在采取措施阻止房价的增长。_5. whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. depend on 相信，信赖, 依靠,依赖, 视而定，取决于 即学即练 all living things_(依靠) the sun for their growth. 拓展：depend on it 没问题，请放心（句末或句首） that /it (all) depends. 那得看情况而定 高考链接 how long are you staying?i dont know._. (08江苏)a. thats ok b. it depends c. never mind d. it doesnt matter6. why they suddenly disappeared still remains a mystery.它们为什么突然消失至今仍是个谜。解析：这是一个含有主语从句_的复合句，其中why是一个连接副词，在从句中充当_。引导主语从句的关联词有三类：从属连词that, whether(不做成分只起连接作用 ). 连接代词who, whom, whose, what, which, whoever, whatever, whichever(在从句中充当主语或宾语)以及连接副词 where, when, how, why（在从句中充当状语）eg:whether hell come here isnt clear.他是否会来这里还不清楚what she did is not yet known.她干了什么尚不清楚。 whoever comes is welcome.不论谁来都欢迎。how this happened is not clear to anyone. 这事怎样发生的, 谁也不清楚。 主语从句(the subject clause)通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾以保持句子的平衡。eg;its clear that the drought-hit southwest provinces need our help.含有主语从句的句子在课文中还有几个，试找出其一并加以分析_即学即练. _ was most important to her, she told me, was her family. (08山东) a. what b. that c. this d. which. _ worries us a lot that so many students drop out of school in the poor mountainous areas. a. it b. that c. one d. what . it is pretty well understood _ controls the flow of carbon dioxide in and out the atmosphere today. (2003上海) a. that b. when c. what d. how . _team wins on saturday will go through to the national championships. (06山东)a. no matter what b. no matter which c. whatever d. whicheverstep iii.consolidation complete the following sentences with the words and phrases below in the correct formin time, preventfrom, depend on, lie, break out, as well as, exist1. the sun is very important to the mankind. man _it for heat and light.2. the first world war _in 1914 and ended in 1918.3. explorers have been sent to mars to make sure whether life_ on it.4. i miss my hometown so much that nothing can_ me_ going back.5. if we dont hurry up , we wont be _ to catch the airplane.6. mary_ her sisters studies chinese in china. 7. the girl _ to me that the hen had _ two eggs the day before. improvement (mini-writing)地球是我们赖以生存的家园。然而随着污染的加重，地球正变得越来越热。我们所能做的就是及时采取措施阻止温室效应(greenhouse effect )的加剧。保护环境不仅是保护地球，也是保护我们自己。人类能否在地球上延续取决于这个问题能否得到解决。 (尽量使用本节所学知识)tips: depend on, with the growth of, it is becoming, what we should do is, as well as_step ivthe following table is for you to evaluate what you have learned in this unit by yourself. fill in the table with a tick a