1、Book 5 Unit 1 Great Scientists 预习学案备课教师: 徐小涛 教研组长审阅：_ 上课时间： 2011/8/26【学习目标】1、了解著名医生约翰斯诺、钱学森、哥白尼等科学家。2、学会使用表示描述人物的句型。3. 学习过去分词作定语和表语的结构。【学习重点】了解著名医生约翰斯诺、钱学森、哥白尼等科学家。【学习难点】 学习过去分词作定语和表语的结构【学习过程】：1. Read the passage and number these events in the order that they happened.-John Snow began to test two th
2、eories.-An outbreak of cholera hit London in 1854.- John Snow marked the deaths on a map.-He announced that the water carried the disease.-John Snow investigated two streets where the outbreak was very severe.-King Cholera was defeated.-He found that most of the deaths were near a water pump.-He had
3、 the handle removed from the water pump.2. Read the passage and answer these questions.John Snow believed Idea 2 was right. How did he finally prove it?_Do you think John Snow would have solved this problem without map? give a reason._Cholera was a 19th century disease. what disease do you think is
4、similar to cholera today? why?_三句式点击：1. With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.with this extra evidence 有了这个额外的证据；with certainty 肯定地，有把握地 在句中作状语，相当于副词.that 引导宾语从句 polluted 过去分词作定语翻译：2. So many thousands of terrified people died ev
5、ery time there was an outbreak.terrified 过去分词作定语every time 短语充当连词作用，还有 the moment/ minute /second; the first / second last time; immediately/instantly/ directlye.g.: The first time I went abroad I could hardly understand what the foreigners said.The moment I saw him, I knew what had happened.3. It s
6、eemed that the water was to blame.be 动词不定式，可以表示该做或不该做的事。be to blame 应该负责；应受责备eg: No one is to leave this building without the permission of the police.You are not to drop litter in this park. 公园里不许乱丢垃圾。翻译：四语法分析：过去分词作定语和表语课文原句：1. He found that it came from the river polluted by the dirty water from L
7、ondon.2. But he became inspired when he thought about helping ordinary people exposed to cholera.过去分词作定语：意义：过去分词含有被动和完成的意思，不及物动词的过去分词只表示完成。a broken heart a ploughed field a risen sun 已升起的太阳位置：单个的过去分词作定语时，通常放在所修饰词前；过去分词短语作定语时，通常放在后面。polluted water death caused by the accident a broken glass a glass b
8、roken by the boy特别提示：有些词像 left 剩下的, given（所给的）, concerned （有关的） 等，习惯上作后置定语，如standing room left the people concerned 有关人士 the book given 所给的书籍当所修饰的词是由 some/ any /nothing/nobody所构成的不定代词或指示代词 those 等时，通常放在其后。如：There has been nothing changed since I left Harbin two years ago.班级 姓名 等级区别：过去分词作定语和现在分词作定语1.
9、 语态不同：现在分词表示主动，过去分词表被动. 如surprising news surprised listenersan exciting movie excited children The teacher told his students a lot of interesting stories.She is interested in Chinese.2. 时间关系上不同：现在分词表动作正在进行；过去分词表动作已经完成。如the changing world 正在发生变化的世界the changed world 已经改变了的世界boiling water boiled water
10、developing countries developed countries过去分词作表语：意义：用在系动词后面，构成系表结构，表示主语所处的状态。如 she looked disappointed.we were encouraged at the news.用于被动语态，表示主语所承受的动作。如the book is well written.the lake is badly polluted.课后练习 在课文中找出下列句子。1人们不知道它的病源，也不了解它的治疗方法。_2每次暴发霍乱时，都有大批惊恐的老百姓病死。_3为防止这种情况再度发生，约翰斯诺建议所有水源都要经过检测。_4.约翰、斯诺怀疑第二个理论是正确的但是他需要证据。_5.他已经显示了疾病是靠细菌传播二不是靠空气传播的。_6.但当他一想到要帮助（那些）受到霍乱威胁的普通百姓，他就感到振奋。_7.第二种看法是在吃饭时把这些病毒引入体内的。_8.看来水是罪魁祸首。_9.在伦敦的里一个地区，她从两个与宽街爆发的霍乱有关联的死亡病例中又发现了有力证据。_
