九年级英语全册 unit 13 we’re trying to save the earth period 2 section a（3a-3c）导学案（新版）人教新目标版

1、Unit 13 Were trying to save the earth【学习目标】1、目的状语从句2、目的状语从句和不定式的转换。【预习合作探究】1. 重点词组1. shark fin soup鱼鳍汤 2. at the top of the food chain处于食物链的顶端3. in the last 20 to 30 years在最近的20到30年间4. environmental protection groups around the world 全球环境保护组织5. develop laws 建全法律 6. the sale of shark fins 鱼鳍买卖2. 重点句子1. But do you realize that youre killing a whole shark each time you enjoy a bowl of shark fin soup.你意识到了吗，当你每次在品尝一碗鱼鳍汤时，你正在杀死一整头鲨鱼。2. So far, no scientific studies have shown that shark fins are good

2、 for health. 到目前为止，还没有科学研究证明鱼鳍对人们的健康有好处。3. This method is not only cruel, but also harmful to the environment.这种方法不仅残酷，而且对环境有害。4. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years. 在最近的20年到30年的时间里，这种鲨鱼已经下降了90%5. Sharks may disappear one day if we do not something to stop the sale of shark fins.如果我们不采取措施来阻止这种鱼鳍买卖，鲨鱼可能有一天会消失。3. 重要知识点This method is not only cruel, but also harmful to the environment.这种方法不仅残酷，而且对环境有害。not onlybut also意为“不仅而且”用于连接两个表示并列关系的成分

3、，着重强调后者，其中的also有时可以省略。如：She not only plays well, but also writes music. 她不仅很会演奏，而且还会作曲。He not only writes his own plays, he also acts in them. 他不仅自编剧本, 还演其中的角色。Not only men but also women were chosen. 不仅仅是男的，女的也有被选中的。He works not only on weekdays but on Sundays as well. 他不仅平时工作，星期日也工作。Not only the students but also their teacher is enjoying the film. 不仅学生们在欣赏这部影片，他们的老师也在欣赏这部影片。说明：若连接两个成分作主语，其谓语通常与靠近的主语保持一致。如：Not only you but also he has to leave. 不只是你，他也得离开。若连接两个句子，not only后面的句子要用倒装，如：Not only d

4、id he speak more correctly, but he spoke more easily. 他不仅说得更正确，而且讲得更不费劲了。4. 语法To cut down air pollution, we should take the bus or subway instead of driving.为了减少空气污染，我们应当乘坐公汽或地铁而不是开车。本句中To cut down air pollution是动词不定式作目的状语。动词不定式做目的状语时的用法一、不定式和不定式短语作目的状语 不定式和不定式短语作目的状语，主要用来修饰动词，表示某一动作或状态的目的。为了使目的意义更加清楚或表示强调意义时，还可以在前面加 in order to 或 so as to。例如： Ive written it down in order not to forget. He shouted and waved so as to be noticed. 在句子中作谓语动词的状语的不定式或不定式短语，表示的是主语的目的，因此，其逻辑主语通常是句子的主语。比较： To draw maps p

5、roperly, you need a special pen.(正) To draw maps properly, a special pen is needed.(误) 由 in order to 引导的目的状语，既可以置于句尾，也可以置于句首，而由 so as to 引导的目的状语，只能置于句尾，而不能置于句首。比较： They started early in order to get there in time.(正) In order to get there in time, they started early.(正) They started early so as to get there in time.(正) So as to get there in time, they started early.(误) 二、不定式的复合结构作目的状语 当不定式或不定式短语有自己的执行者时，要用不定式的复合结构(即在不定式或不定式短语之前加 for + 名词或宾格代词)作状语。例如： He opened the door for the children to come i

6、n. She fetched several bottles which she placed on the counter for Harry to inspect. 三、目的状语从句与不定式的转换 英语中的目的状语从句，还可以变为不定式或不定式短语作状语，从而使句子在结构上得以简化。可分为两种情况： 1. 当目的状语从句中的主语与主句中的主语相同时，可以直接简化为不定式或不定式短语作状语。例如： Well start early in order that/so that we may arrive in time. Well start early in order to/so as to arrive in time. 2. 当目的状语从句中的主语与主句中的主语不相同时，要用动词不定式的复合结构作状语。例如： I came early in order that you might read my report before the meeting. I came early (in order) for you to read my report before the meeting.

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