5. 两者转换：“甲+be+形容词比较级+than+ any other+单数名词(+介词短语)”表示“甲比 同一范围的任何一个人/物都……”，含义是 “甲最……”。例如， The Yangtze River is longer than any other river in China. =The Yangtze River is longer than any of the other rivers in China. =The Yangtze River is longer than the other rivers in China. =The Yangtze River is the longest river in China.长江是中国最长的河流。
The second one is cheaper. The first one is the cheapest of all.
一. 比较级用法：
形容词比较级用于两者（人或事物）之间的 比较，表示其中一个比另一个“更……”或 “较……”，后面用连词than连接另一个所比 较的人或事物。例如：
1.That ruler is longer than this one. 2.Mary is younger than me(I).
二. 形容词和副词的比较级和最高级构成：
规则变化
1.单音节词在词尾加-er比较级，加-est最 高级。
原级 bright young long 比较级 brighter younger longer 最高级 brightest youngest longest
2.以字母e 结尾的词只加-r或- st构成比较级和最高级。

How can one collect this information? What is the source for this information?



Brochure Sales clerk Catalogue Commercial Advertisement Those who have purchased the product Consulting expert









On-site adj. 现场的 Maintenance ['meɪnt(ə)nəns] n. 维护，维修 On-site Maintenance contract 现场维修合同 Software package 软件包 Installation 安装 It is a bargain! 真的很划算。 Worth a) to have a value in money值…钱 be worth something One of the pictures is worth £50,000. Notebook 笔记本 Desktop 台式机
1. She is the youngest of the three children
2. Of all the boys in our class Tom is
the youngest.
3.Tom is the tallest in his class.
Tom is the tallest of all the students.
四. “比较级+and+比较级”表示“越来越……”。 1. He is getting taller and taller. 他变得越来越高了。 2. The flowers are more and more beautiful. 花儿越来越漂亮。 3. He does his homework more and more carefully. 他做作业越来越认真了。 “the+比较级，the+比较级”表示 “越……，越……”。 The more careful you are，the fewer mistakes you’ll make. 你越认真，犯的错误越少。
nice fine white nicer finer whiter nicest finest whitest
3.重读闭音节以一个辅音字母结尾的，应先双写辅音字母， 再加-er 或-est. big bigger biggest
4.以辅音字母加-y 结尾的词，先把-y变为 i， 再加-er\ -est.
Unit 13 Product Description
AIMS


Describe and compare goods and products Describe conditions of sale Make suggestions and compare choices Comparative比较级 and superlatives最高级 adjectives
1. What do these figures refer to?



a 1-year warranty (notebook) b $1990 price (desktop) c 48-hour delivery (desktop) d $50 maintenance contract ( notebook) e $650 free software package (notebook) f 30-day money-back guarantee (desktop)





Compare to examine or judge two or more things in order to show how they are similar to or different from each other compare something/somebody with something/somebody The police compared the suspect's fingerprints with those found at the crime scene.
三. 可以修饰比较级的词: much，a lot，far，…的多 a little，a bit，…一点儿 even甚至，still仍然 例如 1）Lesson One is much easier than Lesson Two. 第一课比第二课容易得多。 2）Tom looks even younger than before. 汤姆甚至比以前更年轻。 3）This train runs much faster than that one. 这 辆火车比那辆跑地快。 4）She drives still more carefully than her husband. 她开车仍然比她丈夫还认真。
汤姆是他们班上/所有学生当中最高的。
副词的构成与用法和形容词相同
提醒： 1.句子中，副词最高级前的the 可省略也可以不 省略，但形容词最高级前面的the 绝对不能去掉。 e.g. Who runs (the) fastest, Tom, Jim or Mike? 2.“主语+be+ one of the+形容词最高级+复数名 词+in/of 短语”表示： “……是……中最……之一”。例如， Beijing is one of the largest cities in China.北京 是中国最大城市之一。
2. True or False



a b c d e
F F T T F
3. Listen and mark the stress



1 2 3 4 5
warranty guarantee installation delivery technical
B. Language focus

Comparatives and superlatives
Use We use the comparative to compare two. We use the superlative to compare one with two or more other items Form We add er to form the comparative and the+est to the superlative.
TOM
ED
nicer
JILL nicest
nice
Tom is nice.
Ed is nicer than Tom.
Jill is the nicest of the three.
1.
8 yuan/a kilo
2.
10 yuan/a kilo
3.
20 yuan/a kilo
The third chicken is cheap.
3.“特殊疑问词+be + the+最高级+甲，乙，or 丙？”用于三者以上的比较。例如， Which country is the largest，China，Japan or Canada？ 哪一个国家最大，中国，日本还是加拿大？ 4.“特殊疑问词+be +the+副词最高级+甲，乙， or丙？”用于三者以上的比较。例如， Which season do you like (the) best，spring， summer or autumn？ 你最喜欢哪一个季节，春天，夏天还是秋天？
easy easier easiest
5.部分双音节词和多音节词分别在原级前加more 构成比较级和most构成最高级，
eg. slowly---more slowly---most slowly； beautiful---more beautiful---most beautiful