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1、Unit 4 Astronomy: the science of the starsPeriod 3Learning about language: Grammar整体设计教材分析This is the third teaching period of this unit. To test whether students have grasped the important and difficult language points they learned in the last period, the teacher should first offer them some revisi
2、on exercises. Then lead in the new lesson.This teaching period mainly deals with the following: 1. Reviewing noun clauses as the object and as the predicative; 2. Learning the new grammar items: noun clauses as the subject. Students often feel noun clauses abstract and difficult to learn, so it is n
3、ecessary to make the lesson interesting and lively, and connect it with their daily life in order to let it easy to accept and understand. Firstly, the teacher can ask students to read the passage HOW LIFE BEGAN ON THE EARTH again, tick out all the sentences from the passage where noun clauses are u
4、sed as the subject, and then translate them into Chinese. Secondly, compare and discover the uses of each noun clause by giving a lot of example sentences. Thirdly, do the exercises in Discovering useful structures on Page 29 and more exercises for students to master the related noun clauses. Finall
5、y, summarize the use of noun clauses as the subject and let students make it clear how each noun clause is being used in the situations.At the end of the class, ask students to do the exercises in Using structures on Page 64 and more additional exercises for consolidation.教学重点Get students to underst
6、and and use noun clauses as the subject.教学难点Enable students to learn how to use noun clauses as the subject correctly.三维目标知识目标1. Get students to know more about noun clauses.2. Let students learn noun clauses as the subject.What it was to become was a mystery. . . . . it was not clear whether the so
7、lid shape was to last or not.能力目标Enable students to use noun clauses as the subject correctly and properly according to the context.情感目标1. Get students to become interested in grammar learning.2. Develop students sense of group cooperation.教学过程设计方案（一）Step 1 Revision1. Check the homework exercises.2.
8、 Dictate some new words and expressions.3. Translate the following sentences.1) 你早晚会来的。2) 我的车与你的不一样。3) 他总是第一个来, 最后一个走。4) 他来不来还不清楚。5) 我们的成败取决于是否每个人都努力工作。6) 我们必须采取措施防止这种疾病的蔓延。Suggested answers:1) You will come here in time.2) My car is different from yours.3) He is always the first to come and the las
9、t to go.4) It is not clear whether he comes or not.5) Our success depends on whether everyone works hard or not.6) We must take actions to prevent this disease (from) spreading.Step 2 PreparationShow some sentences on the screen. Ask students to read each of them and then find out its subject.A tree
10、 has fallen across the road.You are a student.To find your way can be a problem.Smoking is bad for you.“How do you do? ” is a greeting.What she said is not yet known.That we shall be late is certain.Its certain that we shall be late.Step 3 Grammar learning1. Reading and discoveringAsk students to tu
11、rn back to Page 25 to read through the reading passage and find all the sentences where noun clauses are used as the subject and underline them. Then translate them into Chinese.Suggested answers:1) What it was to become was uncertain until between 4. 5 and 3. 8 billion years ago when the dust settl
12、ed into a solid globe.地球会变成什么（样子）, 直到45亿至38亿年前这个云团变成一个固体的球状物, 才确定下来。2) The earth became so violent that it was not clear whether the shape would last or not.地球变得激烈动荡, 不知道这个固体形状是否会继续存在下去。3) What is even more important is that as the earth cooled down, water began to appear on its surface.更重要的是, 随着地球的
13、冷却, 地球的表面就开始出现了水。4) It was not immediately obvious that water was to be fundamental to the development of life.水对于生命的发展会起关键作用, 这一点在当时并不明显。5) What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.很多科学家相信, 由于
14、地球上长期有水存在, 使地球得以把有害气体和酸性物质溶解在海洋里。6) Why they suddenly disappeared still remains a mystery.为什么他们突然消失了, 至今还是个谜。7) So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.所以, 在未来的数百万年中, 生命能否在地球上延续取决于这个问题能否得到解决。2. Thinking and discussing
15、Let students read aloud the sentences they picked out, think over and discuss with a partner how each of these noun clauses is being used in the situations. If students have some difficulty, give them a hand.3. Summing up: noun clauses as the subject.主语从句作主语用的名词性从句, 因其在复合句中作主语, 又称主语从句。（1）连接词:1) 从属连词
16、 that, whether等。that 引导主语从句只起引导作用, 本身无实际意义, 在主语从句中不充当任何成分, 但不能省略。That she left him cut him to the heart.她的离开使他很伤心。由whether引导的主语从句放在句首、句末都可。Whether it will please them is not easy to say. /It is not easy to say whether it will please them.很难说这会不会使他们高兴。2) 连接代词 who, what, which, whoever, whatever, whichever等。What seems e
