1、Unit 7 Whats the highest mountain in the world?课时3Section A(Grammar Focus-4c)课时教学目标1. 学习掌握比较级和最高级的用法。2. 学习掌握描述自然景观特征的语句并熟练运用对自然景观数据进行问答的语句。教学重点：1.Key vocabulary:ocean, the Pacific Ocean.as.as.2. Key sentences: a. Which is the deepest salt lake in the world?b.The Caspian Sea is the deepest of all the
2、 salt lakes.c. Did you know that China is one of the oldest countries in the world?3. Structurea. the deepest of b. one of the oldest countries c. as.as.教学难点：Learn to use the comparative and superlative. 教学过程Step 1 Lead-in1. Show pictures of the top 3 highest mountains, the top 3 deepest salt lakes
3、and the four ancient civilizations.2. Ask students to rank them in order.Step 2 Work on Grammar Focus1. Ask one student to read the sentences.2. Lead students to summarize the expressions of asking facts and relative answers.3. Let them accumulate the expressions.4. Show students the expressions of
4、large numbers and the usage of comparatives and superlatives with adjectives and adverbs.（针对训练习题见上课课件PPT）1. 大数字的表达与读法(1) 1, 000 以上的基数词的表示法：先从右至左数，每三位数加一个逗号。第一个逗号前的数为thousand( 千），第二个逗号前的数为million（百万），第三个逗号前的数为billion（十亿）。读时通常在hundred 后加and，如果读数中百位数为0，则在thousand后加and。(2) 模糊表达：hundred/thousand 加-s 的情况：
5、 hundreds of. 成百上千的；thousands of. 成千上万的2. 形容词和副词比较级的用法(1)“ 比较级+than” 表示一方比另一方。(2)“ 比较级+and+ 比较级” 或“more and more+ 原级” 意为“ 越来越”。(3)“the+ 比较级., the+ 比较级.” 意为“ 越越” 。(4)“the+ 形容词比较级(+of the two.)” 意为“（两者中）更的那一个”。(5) “less+ 形容词/ 副词原级+than” 表示一方不如另一方。(6)“Which/Who+be/ 动词+ 比较级，A or B?” 用于询问两者之间哪个更。(7)“ 倍数+
6、 比较级+than” 意为“ 是的几倍”。3. 形容词和副词最高级的用法(1)“the+ 形容词最高级（+ 名词）+ 范围” 意为“中最的”。(2) “one of the+ 形容词最高级+ 可数名词复数+ 范围” 意为“中最之一”。(3) “Which/Who+be/ 动词+ 最高级，A, B or C?” 表示“ 在A, B, C 三者中谁最？ ”(4)“the+ 序数词+ 形容词最高级+ 单数名词+ 范围” 意为“A, B, C中第几的”。4. 形容词和副词比较级和最高级的变化规则(1) 规则变化：一般情况下，单音节或双音节的形容词（或副词）比较级+-er ， 最高级+-est。以 e
7、结尾的词，比较级+-r，最高级+-st 即可。以辅音字母+y 结尾的变 y 为 i+-er 或 -est。以一个辅音字母结尾的重读闭音节词，双写这一辅音字母后再加-er 或-est。 多音节及部分双音节词，在词前加more 或most。少数单音节词也是这样，如：pleased 和tired。(2) 不规则变化：good /well better best；bad/badly worse worst；many/much more most；far farther/furtherfarthest/ furthestStep 3 Work on 4a1. Ask students to fill i
8、n the blanks with the correct forms of the words in the box.2. After checking the answers, ask students to work in pairs and ask and answer questions about the facts in 4a.3. Choose some students to present their conversations and let them pay attention to the comparative and superlative.Textbook An
9、swers 1. longest; longer 2. high; popular 3. big 4. older; muchKey points1. the Yangtze (River) 长江【拓展】the Yellow River 黄河2. ocean n. 大海，海洋the Pacific Ocean 太平洋【拓展】the Atlantic Ocean 大西洋； the Arctic Ocean 北冰洋； the Indian Ocean 印度洋Step 4 Work on 4b1. Divide students into 4 groups and every two groups
10、debate about two cities or two animals and try to find which one is better.2. Let them list as many aspects of the topics as possible.3. Let them write a report according to the debate.Textbook Answers Answers will vary. Sample answers:Two cities: Singapore and Kuala Lumpur.1. Kuala Lumpur is as mod
11、ern as Singapore.2. Singapore is bigger than Kuala Lumpur and has a larger population than Kuala Lumpur.Two animals: Monkey and Dog1. Some dogs are bigger than monkeys.2. A monkey climbs a tree faster than a dog.Key pointsas+adj.+as. 和一样【拓展】as long as 只要；和一样长Step 5 Group work (4c)1. Ask students to
12、work in pairs. One student writes five questions using comparisons and then asks his partner the questions.2. Choose some pairs to show conversations to others.3. Other students summarize the use of the comparative and superlative in others dialogues.Textbook Answers Answers will vary. Suggested ans
13、wers:1. What is the highest building in our city?2. What is the busiest subway station in our city?3. What is the largest shopping mall in our city?4. Which is the biggest park in our city?5. Which is the longest road in our city?教学效果评价本节课讲练结合，以谈论比较自然景观以及城市、动物等为话题，通过本课时的学习，学生能总结出比较级和最高级的用法并掌握相关提问，学生通过比较认识事物的能力得到提高。作业完成点拨训练UNIT 7 课时3 Section A (Grammar Focus4c) 的练习。教学笔记_5
