形容词和副词比较级的变化规则
1．一般单音节词和少数以-er，-ow结尾的双音节词，比较级在后面加-er，最高级在后面加-est；
  （weight的最高级1）单音节词
  如：small→smaller→smallest short→shorter→shortest
      tall→taller→tallest great→greater→greatest
  （2）双音节词
如：clever→cleverer→cleverestnarrow→narrower→narrowest
2．以不发音e结尾的单音节词，比较在原级后加-r，最高级在原级后加-st；
如：large→larger→largest nice→nicer→nicest    able→abler→ablest
3．在重读闭音节（即：辅音＋元音＋辅音）中，先双写末尾的辅音字母，比较级加-er，最高
级加-est；
如：big→bigger→biggest hot→hotter→hottest    fat→fatter→fattest
4．以“辅音字母＋y”结尾的双音节词， 把y改为i，比较级加-er，最高级加-est；
如：easy→easier→easiest heavy→heavier→heaviest
    busy→busier→busiest happy→happier→happiest
5．其他双音节词和多音节词，比较级在前面加more，最高级在前面加most；
如：beautiful→more beautiful→most beautiful
    different→more different→most different
    easily→more easily→most easily
　注意：（1）形容词最高级前通常必须用定冠词 the，副词最高级前可不用。
　例句： The Sahara is the biggest desert in the world.
      （2） 形容词most前面没有the，不表示最高级的含义，只表示"非常"。
      It is a most important problem. =It is a very important problem.
6．有少数形容词、副词的比较级和最高级是不规则的，必须熟记。
  如：good→better→best well→better→best
      bad→worse→worst ill→worse→worst
      old→older/elder→oldest/eldest many/much→more→most
little→less→least far →further/farther→ furthest/farthest
练  习
一、语音
  选出每组单词中划线部分读音与其余三个不同的单词。
1. （    ）
A、worker
B、workbook
C、worm
D、doctor
2. （    ）
A、weight
B、height
C、eight
D、eighty
3. （    ）
A、than
B、traffic
C、late
D、animal
4.（    ）
A、near
B、year
C、bear
D、hear
5. （    ）
A、more
B、work
C、world
D、worm
二、选择填空。
(    )  1.Are you as _____ as your classmate, Xiao Ming?
              A. tall    B. taller    C. younger
(    )  2.______ Saturday morning, they went for a_______
              A. In, walk  B. On, walk    C. At, walking 
(    )  3.This cat is _____ than that one.
              A. thin    B. thinner      C thiner
(    )  4. Whose ruler is longer, _____?
              A. yours or his    B. your or his    C. yours or her
(    )  5. --What do your parents do after supper?
--They take the _____ dog for a walk.
              A. cute        B. red          C. well
(    )  6.--_____ your grandfather 80 years old?
                --Yes, he _____.
                A. Is, does    B. Are, is        C. Is, is
三、用括号里所给单词的正确形式填空。
I’m _____ (tall) than David.
Who’s _____ (young), you or your brother?
Which is _____ (long), Chang JiangRiver or the Yellow River?
David’s bag is _____ (heavy) than _____ (I).
Gao Shan runs______(fast)than his brother. 
Is your hair as ________  (longer, long)as hers?     
Yang Ling' flies a kite______(higher\taller)than David’s.
四、课文内容填空
Last Sunday morning, Su Hai _____ (go) for a walk in the park. She met Ben and his cousin Jack. They had a _____ (chat). Jack was not the only _____ (children) .He had a brother Jimmy. That’s a _____ (cute) dog. Jack was 6 years old. Ben was _____ (old) than him. Ben was also _____ (tall) and _____ (heavy) than him. Ben was as _____ (old) as Su Hai. But he was _____(strong) than Su Hai. Su Hai had a _____ (twins) sister Su Yang. Su Yang was twenty _____(minute) _____ (young) than Su Hai.
五、完成阅读理解，教师讲评。
Mr. White and Mrs. White work in the same hospital. They have two lovely girls. Their names are Lucy and Lily.
Lucy and Lily are twin sisters. Lucy is 10 years old. Lily is ten minutes younger than Lucy. But Lucy isn’t as tall as Lily. She is shorter than Lily. They are both students in SunshinePri
mary School. Lucy is good at Math. But Lucy is not. She is better at music. They like watching TV.  They watch TV every Saturday and Sunday.
The Whites came to China 2 years ago. They like China very much now. They like Chinese food. 
根据短文内容判断正误。
(    ) 1.The parents work in the same hospital.
(    ) 2. Mr. White and Mrs. White came to China 3 years before.
(    ) 3. Lily is shorter than Lucy.
(    ) 4.After dinner, Lucy and Lily watch TV.
(    ) 5. They like Chinese food. 

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