當兩種物體之間相互比較時，我們要用形容詞或副詞的比較級；
當相互比較的物體是三個或三個以上時，我們就要用形容詞或副詞的最高級。
形容詞的比較級和最高級的特殊變化規則：
一、少數單音節詞前面加 more-, most- 構成比較級和最高級
tired ---- more tired , most tired
fond ----- more fond , most fond
glad ----- more glad , most glad
bored ---- more bored , most bored
pleased---- more pleased , most pleased
二、不規則變化
good /well------- better ,best
bad/badly/ill------ worse , worst
many/much-------more , most
little ------ less , least
far ---- farther, farthes / firther , furthest
old ---- older , oldest (GA)
---- older , oldest / elder , eldest (GB)
三、下列形容詞和副詞的比較級和最高級有兩種形式
cruel----- crueler, cruelest /more cruel , most cruel
strict---- stricter , strictest /more strict , most strict
often----- oftener , oftenest /more often , most often
friendly------ friendlier , friendliest /more friendly , most friendly
clever----- cleverer, cleverest / more clever , most clever
四、下列形容詞和副詞沒有比較級和最高（即表示”最高程度”或”絕對狀態”的形容詞和副詞沒有比較級和最高級）
empty , wrong , perfect , unique , extreme , excellent , favourite (GB)/ favorite (GA) , true , right , correct , extremely ...
形容詞的比較級和最高級用法：
形容詞比較等級用法：
1.沒有比較對象時，用原級。
I have a new computer.
2.兩者比較，程度相同。
A+系動詞+as+adj.+as+B.
Our school is as beautiful as theirs.
3.兩者比較，程度不同。
A+系動詞+not as+adj.+as+B.
The weather here is not as hot as that in the south.
4.A比B更…
The earth is bigger than the moon.
5.比較級前可以用much,even,still,far,a lot,a little,a bit,any等修飾。
Your room is much bigger than mine.
I’m a little shorter than her.
6.用比較級可以表示最高級含義：
John is stronger than any other boy in his class.=John is stronger than any of the other boys.
兩者不屬于同一范疇，不能用other.
Chongqing is bigger than any city in Sichuang.
7.“比較級+and+比較級” 表示“越來越…”
China is becoming more and more beautiful.
Days are getting longer and longer.
8.用the+比較級，the+比較級 表示”越…就越…”.
The busier he is, the happier he feels.
9. Which/Who+is+比較級 A或B？
A和B哪一個/誰更…?
Which is better,this one or that one?
最高級用法：
表示三者或三者以上的人或物的比較，一個在某方面超過其他兩個或多個時，用最高級，結構是
主語+系動詞+the+形容詞最高級+of/in短語。
This story is the most interesting of the three.
1. one of the+形容詞最高級+名詞復數
它的意思是最…之一。
English is one of the most important languages in the world.
2. which/who…+is+形容詞最高級
“…最...”
Which is the heaviest,the horse,the sheep or the elephant?
3.最高級前可以用序數詞
The Yellow River is the second longest river in China.
形容詞的比較級和最高級的變化規則：
構成 | 原級 | 比較級 | 最高級 |
一般加er，est | tall | taller | tallest |
以字母e結尾只 | large | larger | largest |
以一個輔音字母結尾的 | red | redder | reddest |
hot | hotter | hottest | |
thin | thinner | thinnest | |
| easy | easier | easiest |
happy | happier | happiest | |
ugly | uglier | ugliest | |
early | earlier | earliest | |
其他雙音節詞和多 | interesting | more interesting | most interesting |
本文來自：逍遙右腦記憶 /chuzhong/283844.html
相關閱讀：一定要收藏的英文至理名言-2
一般現在時表示將來情況
初中英語閱讀理解細心檢查答題技巧
初中英語知識點：關系代詞
attention搭配大全