一、形容词、副词的比较级和最高级的构成规则1．大多数单词的变法
small→smaller→smallest short→shorter→shortest great→greater→greatest clever→clevere r→cleverest narrow→narrower→narrowest tall→taller→tallest
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；
large→larger→largest nice→nicer→nicest
3．先双写末尾的辅音字母，比较级加-er，最高级加-est；
big→bigger→biggest hot→hotter→hottest fat→fatter→fattest thin-thinner-thinnest sad-sadder--sa ddest 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；
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；
beautiful→more beautiful→most beautiful
different→more different→most different
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。
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。
good-----better------best好的
well------better------best身体好的
bad------worse------worst坏的
ill--------worse-------worst病的
many--------more------most许多 much------more--------most许多
few------less-------least少数几个little-------less------least少数一点far------further------furthest更进一步，程度
far------farther------farthest更远，路程
old-------older------oldest年老的（指年纪）
old------elder-------eldest年老的（指兄弟姐妹的排行）
二、形容词、副词的比较级和最高级的用法
1．“A + be +形容词比较级 + than + B”意思为“A比B更……”。
如：This tree is taller than that one. 这棵树比那棵树高。
注意：①在含有连词than的比较级中，前后的比较对象必须是同一范畴，即同类事物之间的比较。
②在比较级前面使用much，表示程度程度“强得多”。
如：A watermelon is much bigger than an apple.
2．“比较级 + and + 比较级”或“more and more +原级”表示“越来越……”
It becomes warmer and warmer when spring comes. 春天来了，天气变得越来越暖和了。It is gett ing cooler and cooler.天气越来越凉爽。
The wind became more and more heavily.风变得越来越大。
Our school is becoming more and more beautiful. 我们的学校变得越来越美丽。
3. “the +比较级……, the+比较级”，表示“越……越……”。
The more money you make, the more you spend.钱你赚得越多，花得越多。
The sooner，the better. 越快越好。
4.形容词、副词的最高级形式主要用来表示三者或三者以上人或事物的比较，表示“最……”的意思。句子中有表示范围的词或短语。如：of the three, in our class等等。如：He is the tallest in our class. 他在我们班里是最高的。
5. 比较级与最高级的转换：
Mike is the tallest intelligent in his class.
Mike is more taller than any other student in his class.
【练习】
写出比较级和最高级：
small fast
heavy beautiful
busy delicious
old young
thin big
high well
early slow
shot much
long tall
nice happy
hot fat
many far
ill bad
good little
一．1. My school is _____, but Tom’s school is _____than mine. And Sally’s school is the _________. (small)
2. Rabbits can run _______, but tigers can run _____ than rabbits, and cheetahs can run ___________of the three. (fast)
3.Pig is ________, but deer is ______than pig, and elephant is the
______________ (heavy)
4. I’m ___________, but she is _______ than me. (beautiful)
5. Every day is _______. But today is the ______ day I have ever had. (busy)
6. I think pizza is the ________ food of all. (delicious)
7．My brother is two years ______ (old) than me.
8. Is your sister _______(young) than you? Yes,she is.
9. Who is ________(thin),you or Helen? Helen is.
10. Whose pencil-box is _____ (big),yours or hers? Hers is.
11．Ben jumps ______ (high) than some of the boys in his class.
12．Does Nancy sing ______(well) than Helen? Yes, she does.
13．My eyes are ________(big) than hers.
14．Which is ________(heavy),the elephant or the pig?
15．Who gets up ______ (early),Tim or Tom?
16．Do the girls get up____(early) than the boys? No,they______.
17．Jim runs ____ (slow). But Ben runs _____(slow).
二，根据句意写出所缺的单词
(1) I’m 12 years old.You’re 14. I’m than you.
(2) A rabbit’s tail is than a monkey’s tail.
(3) An elephant is than a pig.
(4) A lake is than a sea.
(5) A basketball is than a football.
三，选出合适的单词完成句子
heavy tall long much many big
(1) How is the Yellow River?
(2) How is Mr Green? He’s 175cm.
(3) How are your feet? I wear size 18.
(4) How is the white T-shirt? It’s 100 yuan.
(5) How apples are there in the bag? There are 5.
(6) How is the fish? It’s 2kg.