八下unit7sectionA1a-1c

1、Who is taller, Pan Changjiang or Liu Xiang?Liu Xiang.Which box is bigger, the red box or the green box? The red box.This apple is the biggest of all.Which apple is the biggest?形容词和副词的比较等级形容词和副词的比较等级 大多数形容词和副词有三个等级大多数形容词和副词有三个等级: a. 原级，原级，即原形。如即原形。如big(大）。大）。 b. 比较级，比较级，表示表示 “ 较较 ” 或或 “ 更更一些一些 ”。 如如:

2、 bigger（更大）（更大） c. 最高级，最高级，表示表示 “最最”。如。如: biggest（最大）（最大）1. 规则变化规则变化形容词和副词的比较级和最高级的构成形容词和副词的比较级和最高级的构成(1)一般在词尾加 -er 或 -est highhigher-highest(2)以字母e结尾的词，在词尾加 r 或 -st latelater-latest(3)重读闭音节词词尾只有一个辅音字母时，先双写该辅音字母，再加 er 或 -est bigbigger-biggest(4)以“ 辅音字母+y ”结尾的双音节词，先把“ y ”改为“ i ”，再加 er 或 -est happyhap

3、pier-happiest(5)多音节词和部分双音节词，在词前加 more 或 most popular-more popularmost popular2. 不规则变化不规则变化原级比较级最高级good/wellbetterbestbad/badlyworseworstmany/muchmoremostlittlelessleastfarfartherfarthestfurtherfurthest 比较级的用法比较级的用法 表示两者（人或事物）的比较表示两者（人或事物）的比较, 用用 “比较级比较级 + than”。Liu Xiang is taller than Pan Changjian

4、g.Beijing is bigger than Hainan. 最高级的用法最高级的用法 表示三者或三者以上表示三者或三者以上 ( 人或事物人或事物 ) 的比较。最高级前面一般加定冠词的比较。最高级前面一般加定冠词the, 后面可带短语后面可带短语in/of来说明比较的范围。来说明比较的范围。 如如: Tony is the tallest in our class. This ruler is the longest of all. 南岳衡山 海拔海拔1300.2米米 东岳泰山英文名：Mount Tai海拔1532.7米 北岳恒山北岳恒山西岳华山西岳华山海拔2154.9米，居五岳之首。 海

5、拔2016.1米 中岳嵩山中岳嵩山 海拔海拔1491.7米米 泰山泰山 1532.7米米 衡山衡山 1300.2米米 华山华山 2154.9米米 恒山恒山 2016.1米米 嵩山嵩山 1491.7米米What is the highest mountain of the five mountains?Whats the highest mountain in China?Emei Mountainsquare skwe(r) n. 平方平方meter mi:t(r) n. 米米deep di:p adj. 深的深的desert dezt n. 沙漠沙漠Qomolangma Do you kno

6、w its name?珠穆朗玛峰简称珠峰，位于中国和尼泊尔交界的喜马拉雅山脉之上，终年积雪。高度8,844.43米，是世界第一高峰，最长达26公里。Do you know how high it is? Its about 8,844 meters high, the highest mountain in the world. Its 6,671 kilometers long, the longest river in the world. The Nile尼罗河长6,671 千米，是世界上最长的河流。Do you know its name?Do you know how long it

7、 is?It is 1,025 meters deep, the deepest salt lake in the world. Do you know its name?The Caspian SeaDo you know how deep it is?里海是世界上最大、最深的咸水湖，深为1,025米。It is about 9,600,000 square kilometers in size， the biggest desert in the world. The SaharaDo you know its name?Do you know how big it is?撒哈拉沙漠是世界

8、第一大荒漠，大约960万平方千米A: -What is the highest mountain/ the longest river / the deepest salt lake/ the biggest desert in the world?B: - QomolangmaThe NileThe Caspian SeaThe Sahara1a Match the facts you know.Qomolangma about 9,600,000 square kilometers in sizeThe Sahara1,025 meters deepThe Caspian Sea6,671

9、 kilometers longThe Nile8,844.43 meters high8,844.43 meters high. 8,844.43米高米高 meters high (long, wide, deep)米高（长，米高（长，深深)。英语表示英语表示“有多有多高高（长长,宽宽,深深）”时，一般时，一般将将基基数词数词和和数量单位数量单位放在表示放在表示长宽高深长宽高深的的形容词形容词前前作状语作状语。e.g. The tree is 2 meters high. 提问提问How+high/deep/long/wide +be+主语？主语？e.g. How high is the t

10、ree？注意：注意：square kilometer=km2 square meter=m2英语数字读法英语数字读法1百位数百位数 “hundred(百百)”,表示表示101999先说几百，再加先说几百，再加and,再加末尾两位再加末尾两位数或末尾数。数或末尾数。 101 one hundred and one 320 three hundred and twenty 2千位数以上千位数以上 从数字的从数字的右端向左端右端向左端数起，每三位数加一个逗号数起，每三位数加一个逗号“，”。从右开始，。从右开始，第一个第一个“，”表示表示 thousand（千）（千），第二个第二个“，”表示表示mil

11、lion（百万）（百万），第三个第三个“，”表示表示billion(十亿十亿)。然后一节一节用几百几十几的方法表示。在这类数词中然后一节一节用几百几十几的方法表示。在这类数词中hundred, thousand, million , billion等词一般都用等词一般都用单数形式。单数形式。1,025 one thousand and twenty-five6,671 six thousand six hundred and seventy-one 9,600,000 nine million six hundred thousand568,095,301,700hundredtousandm

12、illionbillion十亿十亿千千百万百万百百注意：从后往前，三个数字标一个逗号，读的时候从前读到后注意：从后往前，三个数字标一个逗号，读的时候从前读到后213547028503786541053786549908650837065417902How high is Qomolangma? Qomolangma Qomolangma Its 8,844.43 metrs high. The Nile Its 6,671 kilometers long. The NileHow long is the Nile?The Caspian Sea The Caspian Sea It is 1,

13、025 metres deep.How deep is the Caspian Sea? The Sahara It is about 9, 600 ,000 square kilometres in size.The SaharaHow big is the Sahara ?1b. Listen and choose the best answer.( ) 1. Qomolangma is _ than any other mountain in the world. A high B higher C the highest ( )2. The Sahara is _ desert in

14、the world.A the highest B the longest C the biggest( )3. The Caspian Sea is _ of all the salt lakes.A the deepest B the longest C the cleanest( )4. The Nile is _ river in the world.A the longest B the biggest C the deepest BAAC1b. Listen and complete the sentences.1. Qomolangma is _ than any other m

15、ountain in the world. 2. The Sahara is _ desert in the world.3. The Caspian Sea is _ of all the salt lakes.4. The Nile is _ river in the world.higherthe biggestthe deepestthe longest1c. Use the information in 1b to Make conversations .A: What is the highest mountain in the world?B: Qomolangma.A: Wha

16、t is the longest river in the world?B: The Nile.A: What is the biggest desert in the world?B: The Sahara.A: What is the deepest salt lake in the world?B: The Caspian Sea.Whats the highest mountain in ?JapanAmericaEnglandRobson, Mount (罗布森山) Fuji Mountain(富士山)Mount Mckinley(麦金利山)Ben Nevis(本尼维斯本尼维斯）Ca

17、nada注意！Qomolangma is higher than any other mountain in the world. 注意：此句是比较级表达最高级的含义。注意：此句是比较级表达最高级的含义。any other +单数名词单数名词 “其它任何一个其它任何一个” 例如：例如：李明是他们班上最高的一个学生。李明是他们班上最高的一个学生。Li Ming is taller than any other student in his class.= Li Ming is the tallest student in his class.注意！The Caspian Sea is the d

18、eepest of all the salt lakes. 注意：用于最高级表达范围的介词：注意：用于最高级表达范围的介词：of ,in, among例如：在这三个中例如：在这三个中Li Ming是高的。是高的。Li Ming is the tallest of the three. Summing up（总结）（总结） New words : square -平方；正方形；广场平方；正方形；广场 meter-米；公尺米；公尺deep -深的深的 desert-沙漠沙漠 Phrases: square kilometre 数词数词+ metres deep/long/high any other mountain in the world of all the lakes Important sentences: 1.The Nile is 6,671 kilometres long. 2. Qomolangma is higher than any other mountain in the world. 3. The Caspian Sea is the deepest of all the salt lakes. 单项选择。 ( ) 1. The Sahara is _ in the wo