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1、1. 原级比较：两者程度相同。用句型原级比较：两者程度相同。用句型as+ 形容词形容词/副词副词+as表示表示, 否定名式为否定名式为: not as/so+形容词形容词/副词副词as。 e.g. Dick is as tall as his brother. Tom speaks as quickly as his cousin. I have never seen a person as / so clever as he is.形容词和副词比较等级的用法形容词和副词比较等级的用法2. 比较级：比较级：A. 表示表示A超过超过B。此时用形容词和副词的。此时用形容词和副词的比较级。比较级。e
2、.g. Our classroom is brighter than yours. Dogs run faster than rabbits. I dont think math is more important than physics.B. 表示表示A不如不如B。 句型：句型：less+形容词形容词 /副词原级。副词原级。e.g. Rabbits ran less fast than dogs. Jenny is less clever than her sister. It rains less often here in autumn than in spring.3. 形容词和副词
3、比较级的特殊用法形容词和副词比较级的特殊用法A. 越来越越来越 比较级比较级+ and+比较级比较级e.g. You are growing taller and taller. 你越长越高了。你越长越高了。 English is becoming more and more important. 英语越来越重要了。英语越来越重要了。B. 越越， 越越 the +比较级比较级+ the +比较级比较级e.g. The more careful you are, the better you will do in the exam. 你越小心，就会考得越好。你越小心，就会考得越好。 The mo
4、re you practice, the more fluently you will speak. 你练得越多，讲得就越流利。你练得越多，讲得就越流利。C. 表示两者之中比较表示两者之中比较的一个，用的一个，用 of 引导，比较级前加上引导，比较级前加上the。 e.g. Jack is the taller of the two brothers. 杰克是兄弟两中较高的一个。杰克是兄弟两中较高的一个。 This is the bigger of the two rooms. 这个房间是两个中较大的一个。这个房间是两个中较大的一个。D. no more than表示表示“只；不超过；不只；不
5、超过；不 多于多于”，相当于，相当于only。e.g. His whole school added up to no more than one year. 他所接受的学校教育不过一年。他所接受的学校教育不过一年。 She has no more than one yuan in her pocket. 她兜里只有一块钱。她兜里只有一块钱。E. no morethan 表示表示“一样一样不不”；而；而not morethan则表示则表示“不像不像那样那样”，相当于，相当于“not so as”。e.g. Hs is feeling no better than yesterday. 他觉得不
6、比昨天好多少。他觉得不比昨天好多少。She is not more generous than her younger sister. 她不如她妹妹那样慷慨大方。她不如她妹妹那样慷慨大方。She is not so generous as her younger sister. 相当于：相当于：F. no less than表示表示“多达，多达， 那样那样多多; 至少至少, 起码起码”, 相当于相当于as much /many as, 蕴含这个数是大的；而蕴含这个数是大的；而not less than表示表示“不少于不少于”, 不强调这不强调这个数的大小个数的大小, 只说明数据本身。只说明数据
7、本身。e.g. I have no less than ten dictionaries. 我起码有我起码有10本字典。（至少）本字典。（至少）I have not less than ten dictionaries.我有的词典不少于我有的词典不少于10本。本。（不含（不含“我的词典多我的词典多”的意思，只说的意思，只说明一个事实。）明一个事实。）G. no less than表示表示“不比不比差；差；与与同样地同样地”， 相当于相当于“as as”。 e.g. She is no less beautiful than her sister. 她和她的姐姐一样漂亮。她和她的姐姐一样漂亮。H
8、. 不用比较级的形容词如：不用比较级的形容词如：senior, junior, superior, inferior等。等。e.g. He is three years senior to me. 他比我大三岁。他比我大三岁。 Your knowledge of electronics is much superior to mine. 你对电子学的知识远远超过我。你对电子学的知识远远超过我。I. 比较级的修饰语。通常为副词或短语，比较级的修饰语。通常为副词或短语，置于比较级前面，置于比较级前面， 说明比较级的程说明比较级的程度。度。a little, little, a bit, bit,
9、a lot, a great deal, much, far, rather, slightly, by far, even, still, nearly, almost, any, just, () times等。等。e.g. The moon is much smaller than the earth. The result of the experiment turned out to be even better than expected. Speak a bit more slowly, please. The output of the paper mill is three
10、times higher than it was last year. Make sentences about the comparative sizes of the pairs. Use the words in the brackets.Yangtze RiverSonghua River6,300 kilometers2,309 kilometerslong/lengthExample:A: The Yangtze River is about three times as long as the Songhua River.B: The Yangtze River is about
11、 three times longer than the Songhua River.C: The Yangtze River is about three times the length of the Songhua River.Winter in HarbinWinter in Beijing-20-5(cold/coldness)A: Winter is four times as cold in Harbin as in Beijing.B: Winter is four times colder in Harbin than in Beijing.C: Winter in Harb
12、in is four times the coldness of in Beijing.Mount Tai Mount Qumolangma1521m8848mA: Mount Qumolangma is about six times as high as Mount Tai .B: Mount Qumolangma is about six times higher than Mount Tai .C: Mount Qumolangma is about six times the height of Mount Tai .my housemy aunts houselarge/size8
13、0 square meters160 square metersA: My aunts house is twice as large as my house.B: My aunts house is twice larger than my house.C: My aunts house is twice the size of my house.Lily weighsTom weighs45 kilograms90 kilogramsheavy/weightA: Tom weighs over twice as heavy as Lily.B: Tom is over twice heav
14、ier than Lily.C: Tom is over twice the weight of Lily.Use the words below to write sentences as in the examples.Example:temperature / get / lowThe temperature gets lower and lower.1. hot metal / get / big The hot metal is getting bigger and bigger.2. magnesium / get / hot The magnesium is getting ho
15、tter and hotter.3. sun / get / strong during the morning The sun is getting stronger and stronger during the morning.4. sea / become / warm The sea is becoming warmer and warmer.A. Underline the comparative expressions.B. Circle the adverbs used to give more information about the comparative express
16、ions.Look at the following sentences, and:1. Come a bit closer.2. We need rather more than that.3. It weighs a little more than before.4. Itll be a lot heavier than magnesium.5. Is it any heavier?6. We need a piece which is (very) much bigger than that.Compare the items / people you know. Use one of
17、 these expressions.Example: Two lessonsThe physics lesson was a lot more interesting than the chemistry lesson.a little a bit a lot rather no any (very) much lots1. Debbie长得很快，她个子越来越高。长得很快，她个子越来越高。 Debbie is growing fast. Shes getting _. 2. 我们图书馆藏书的数量是你们图书馆我们图书馆藏书的数量是你们图书馆的四倍。的四倍。 The books in our l
18、ibrary are _ than those in yoursFill in the blanks.taller and tallerfour times more3. 这本词典的厚度比你从图书馆借的那这本词典的厚度比你从图书馆借的那本厚本厚4倍。倍。 This dictionary is _ as the one you borrowed from the library.four times as thick4. 地球的体积是月球的地球的体积是月球的49倍。倍。 The earth is 49 times _ the moon.5. 天气越暖和，我感到越舒服。天气越暖和，我感到越舒服。 _ the weather is, _ I feel.the size ofThe warmerthe betterDo exercises 1-4 on page 91.