一：使用原级的场合
1． 描述单独的一个人时，如：Lily is beautiful .
2． 当句中有very , quite , too , much too , so , rather 等时；如；
The flowers in our school are quite beautiful .
The box is too heavy,I can’t carry it .
It is raining so heavily that I can’t carry it .
3.感叹句中用原级形式，如：How hot it is today ！ What a lovely girl she is ！
4．在as … as（和 … 一样）； not as … as （不如 … ；和 … 不一样 ）； the same … as（和 … 一样的 ）；等这些结构中应该用原级。如：
English is as important as Chinese . Maths is not as interesting as music .
二：比较级使用的场合：
1． 两者进行比较时，用比较级。如：Who is ( tall ), Tom or Jim ?
2． 句中有时 than 用比较级。The earth is bigger than the moon .
3． 表示越来越…时应该用比较级。The days in winter get shorter and shorter .(越来越短)
English is more and more popular（越来越受欢迎） in China .
用比较级+and +比较级 和more and more … 来表示越来越 。
4． 表示某某越 … 时，某某就越 … 时用：The + 比较级 … ，the + 比较级 …“‖ 如The more you eat , the fatter you will be .你吃的越多。你就会越胖 。
5． 跟在much \ a little \ far \ even等后面应该用比较级。
much better(更好的多) a little earlier （更早点儿） ; far heavier（远远重的多） ; even more important（甚至更重要）
6． 在下列固定短语中用比较级。
no longer \ not any longer(不再) ; no more \ not any more（不再） ; sooner or later（迟早） , more or less （或多或少）
三：使用最高级的场合：
1． 当句中对象是三者或以上时，句中的形容词或副词常用最高级。
Who is the tallest boy , Tom , Bill or Sam ?
2． 句中的序数词后用最高级。
Changjiang is the first longest river in Chna .（长江是中国最长的河流）
3． 当句中有one of +the +最高级+名词复数（某某中最 之一） , of all , at, in ,等时，常用最高级。
China is one of the largest countries in the world .（中国是世界上最大的国家之一）
Of all the students , Jim runs the fastest .（在所有的学生当中，杰姆跑得最快。）
形容词、副词比较级和最高级的构成：
一：单音节和部分双音节形容词、副词两级的构成：
1． 直接+ er 构成比较级（更…）；+est 构成最高级（最…）；
long---longer ---longest ; tall---taller----tallest
2. 以e 结尾，直接+ r 构成比较级，+st 构成最高级；
nice---nicer----nicest , late----later -----latest
3.辅音字母+y结尾，改y 为 ier 构成比较级，改y 为iest 工程最高级；
early----earlier----earliest , happy----happier----happiest
4.初中阶段有9个形容词需要双写最后一个字母加 er 构成比较级，需要双写最后一个字母加est构成最高级。
thin(瘦，薄) -- big （大） mad
slim（苗条的）
sad （伤心的，难过的） red（红色的）
wet （潮湿的） hot （热的） fat（肥胖的）
二：部分双音节及多音节形容词和副词的比较级和最高级
1． 以—ed结尾的形容词，加more 构成比较级，加 the most构成最高级；
tired (疲劳)---more tired (更疲劳)---the most tired(最疲劳)
2． 以—ful结尾的形容词，加more 构成比较级，加 the most构成最高级；
wonderful(精彩的)--- more wonderful（更精彩） ---- the most wonderful （最精彩的）
3． 以—ly结尾的大部分形容词或副词，加more 构成比较级，加 the most构成最高级；
friendly--- more friendly--- the most friendly; quickly—more quickly---the most quickly
4． 其它多音节的形容词或副词：如，important , different , popular , interesting , 等。
三：五个不规则形容词或副词的比较级和最高级：
good/ well（好） ----better（更好） ----- best （最好）;
bad / badly / ill （坏的， 糟糕的）----worse（更坏）----worst（最糟糕） ;
many / much（许多）----- more （更多）--- mos（最多）t ;
little （少）----less（更少）----least（最少） ;
far:（远）----farther （更远）----farthest（最远） ;
有关形容词三级的练习：
一：用所给词的三级形式填空：
1．Lucy is very ( tall ) , she runs quite ( fast ) .
2. This box is so ( heavy ) that I can’t carry it .
3.How ( lovely ) the dog is ！Do you know whose it is ?
4.Whose room is ( beautiful ) , Lucy’s or Kate’s ?
5. Lilei is as ( strong ) as Tom , but he doesn’t run as (quickly ) as Tom .
Tom runs ( quickly ) in his class
6. Lily is ( pretty ) , Jill is ( pretty ) than Lily , Ann is ( pretty ) of the three .
7.The ( hard ) you study , the ( well ) you’ll be at your lessons .
8.Computer is the first ( useful ) invention in the world .
9.Winter is coming , the days are getting and ( short ) .
10.Mr Green is one of ( popular ) English teachers in our school .
11. or ( soon , late ) , your dream will come true .
12.In my family , my mother gets up ( early ) .
13.Today is cold , tomorrow will be even ( cold ) .
14.In modern society , English is becoming and ( important )
15. Tom goes to school ( early ) , Lilei goes to school ( early ) than Tom ,Bill goes to school ( early ) .
二：写出下列各词的比较级和最高级：
1) . late nice
2) .early happy heavy
3) slim big thin fat hot wet red sad
4) .long tall
5) .good \ well bad \ ill \ badly
far little many \much
6) popular interesting
careful helpful
slowly carefully
tired worried
三：根据要求转换句型：
1．Mike is 13 years old . Tom is also 13 years old .（合并为一句）
Mike is Tom .
2. I have 20 books . My brother has 24 books . （ 合并为一句）
My brother has books I have .
3. Tom is taller than any other student in his class . ( 改为同义句)
Tom is the student in his class .
4.English is not as interesting as music .(改为同义句)
Music is English .
四. 用适当形式填空：( 确定范围)。
1. Bob is _________ ( young ) than Fred but ___________ (tall) than Fred.
2. Yingtian is not as ___________ (tall) as Yongxian.
3. Almost all the students' faces are the same but Li Deming looks _______
(fat) than before .
4.Which is _________ (heavy), a hen or a chicken?
5.-- How _________ (tall) is Sally?
-- She' s 1.55 metres ________ (tall). What about Xiaoling?
-- She' s only 1.40 metres ________ (tall). She is much _______ (short) than Sally.
She is also the _______ (short) girl in the class.
6. He is ______ (bad) at learning maths. He is much _______ (bad) at Chinese and he is the _________ (bad) at English.
7. Annie says Sally is the ________ (kind) person in the world.
8.He is one of the_________(friendly) people in the class, I think.
9. A dictionary is much _________ (expensive) than a story-book.
10. An orange ia a little ______ (big) than an apple, but much ________
(small) than a watermelon.
11. The Changjiang River is the _______ (long) river in China .
12. Sue is a little ___________ (beautiful) than her sister.
13.My room is not as _________ (big) as my brother' s.
14.--How difficult is physics? --I' m not sure.
-- Is it ________ (difficult) than maths? -- I don' t think so.
15.-- Annie plays the piano very ___________ (well).
-- Sue plays it _____ (well) than Annie. And Sally plays it the ______ (well)
16. Saturday is my _________ (busy) day in a week.
17. Her mother is getting ____________(fat) and ________ (fat).
18. I think it' s too expensive. I' d like a _____________ (cheap) one.
19. He comes to school much ____________ (early) than I.
20.This book is not as _____________ (interesting) as that one.
21. Your classroom is __________(wide) and ___________(bright) than ours.
22. Practise as __________ (much) as you can.
23. The ________ (much), the ____________ (good).
24. Nowadays(现在) English is __________( important ) than any other subject.
25. Most of the students think a lion is much ________(dangerous) than a
bear and it is the __________ (dangerous) animal in the world.
五；.改错：
1. He is as taller as I am.
2. She is a little thiner than she looks.
3. Bob is heavier than any other boys in the class.
4.The girls study the better than the boy.
5. It is one of the most interesting book than I have ever read.
6. He says Mary is most friendliest person in the class.
7. Which city is most beautiful, Beijing or Guangzhou ?
8. Jack works hard. Mike works very harder than Jack.
9. London is the bigger city in Britain .
10.Bob plays football badly but Fred plays football much badlier than Bob.
六.完成句子：
1 她看起来不如玛丽年轻。
She doesn't look __________ _________ __________ Mary.
2.杰克的父亲比母亲大一岁。
Jack's father is __________ _________ _________ than her mother.
3.我们的教室比他们的明亮得多。
Our classroom is ___________ ___________ than theirs.
4。当心！这条路越来越危险。
Look out! The mad is becoming ________ and _________ ________.
5.你喜欢哪种动物，猫还是狗？
Which animal do you like __________ , a cat or a dog?
6.你学习越努力，英语成绩就越好。
you study , you will be at English .
7..越来越多的学生花越来越少的时间读英语。
students spend time reading English .
8. 你能用更少的人力和更少的金钱将工作做的更好吗？
Can you do the work with people and money ?
9.他花了最少的时间摘了最少的苹果。
He spent time picking apples .
