形容词的比较级和最高级英语中的形容词通常用三种形式来表达事物的等级差别，分别是原级、比较级和最高级。
大部分形容词的比较级和最高级是通过变化词尾来实现的，属于规则变化，但也有少数是不规则变化。
英语中有些形容词说明形状、材质等，还有形容词没有程度可分或其本身就表示某种程度，故而没有比较级和最高级。
常见的有：right 正确的 wrong 错误的 excellent 最好的 final 最后的last 最后的 possible 可能的 first 第一的 east 东方的empty 空的 wooden 木制的 impossible 不可能的 favourite 最喜欢的round 圆的 golden 金色的 square 方的一、比较级和最高级的构成1.规则变化（1）单音节和少数双音节形容词变化规则如下：1）单音节词末尾加-er（比较级），-est（最高级）【例】原级比较级最高级great greater greatestsmall smaller smallestclean cleaner cleanest2）单音节如以e结尾，只加-r（比较级），-st（最高级）【例】fine finer finestnice nicer nicestwide wider widest3）以一个辅音字母结尾的重读闭音节单音节词，须先双写这个辅音字母，再加-er（比较级），-est（最高级）【例】big bigger biggesthot hotter hottestfat fatter fattest4）以“辅音字母+y”结尾的双音节词，将y变为i，加-er（比较级），-est（最高级）【例】happy happier happiesteasy easier easiestheavy heavier heaviestfunny funnier funniest5）以-er，ow，-ble结尾的双音节词，末尾加-er（比较级），-est（最高级）【例】clever cleverer cleverestnarrow narrower narrowestable abler ablest(2)其他双音节词和多音节词在词前加more（比较级），most（最高级）【例】tired more tired most tiredinteresting more interesting most interestingdifficult more difficult most difficult(注意：A：有词根加ly构成的形容词，在词前加more（比较级），most（最高级）如friendly----friend+ly构成, friendly more friendly most friendly；B：以形容前缀un构成的三音节形容词不适合上述情况，如unhappy----unhappier----unhappiest,untidy----untidier----untidiest )2.不规则变化二、比较级的用法（1）高于或低于另一方的比较运用“比较级+than”的结构可以表达一方超过或低于另一方的情况。
即：物体A + am / are / is + 形比+ than + 物体B.She is more beautiful than my sister. 她比我的姐姐漂亮。
This bottle is bigger than that one. 这瓶子比那瓶子大。
(2)比较级+and+比较级这种结构表示事物本身程度的逐渐增长，意为“越来越...”。
She is becoming fatter and fatter. 她变得越来越胖。
It is getting warmer and warmer. 天气变得越来越暖和。
三、最高级的用法1.表示在三者或三者以上中程度最高最高级是表示在三者或更多者中程度最高的比较形式。
此时应运用形容词的最高级，其句式为：the+形容词最高级+（名词）+表示范围的短语或从句,即：物体A + am / are / is + the + 形最高级+ （名词）+比较范围（of + 人/物，in +地方）Lucy is the most beautiful girl in her school. 露西是她学校最漂亮的女孩。
Jim is the thinnest of the three boys. 吉姆是这三个男孩中最瘦的。
2.“最......”的其他表达方法。
（1）运用比较级表达最高级的概念。
Ann is taller than any other girl in her class.Ann is taller than the other girls in her class.Ann is taller than the rest of girls in her class.以上三句表达的意思等同于最高级的含义：Ann is the tallest of the girls in her class. 安是她们班上最高的女生。
四、比较级和最高级的修饰语1.比较级的修饰语修饰比较级的常用语和短语主要有：much(...得多）,a lot（...得多）, a little（...一点）, a bit（...一点）,twice（...两倍）, five times（...五倍）等。
Do you feel much better today than yesterday?你今天感觉比昨天好很多了吗？2.最高级的修饰语常用的最高级的修饰语有序数词the first，the second等以及almost(差不多，几乎）, nearly（差不多，几乎）。
Africa is the second largest continent. 非洲是第二大洲。
Amy’s writing is almost the best of all the students.在所有学生中，艾米的书写几乎是最好的。
五、需要注意的情况1.使用比较级时常见的错误（1）more 不可修饰比较级，但是much可以用来加强比较级，意为“...的多”、“更...”。
She looks more younger than I. (×)She looks much younger than I. (√)(2)比较的对象或范围出现错误。
The weather of Shanghai is hotter than Beijing. (×)(比较的对象应该是北京的天气，而不是北京）The weather of Shanghai is hotter than that of Beijing. (√)上海的天气比北京的热。
China is larger than any country in Asia. (×) (出现了逻辑上的错误，中国就是亚洲的一个国家，应当排除在外)China is larger than any other country in Asia. (√) 中国比亚洲别的国家要大。
2.形容词最高级前通常要加定冠词the,而以下几种情况一般不需要加定冠词the:（1）形容词最高级前有序数词、物主代词、指示代词或名词所有格等限定词修饰时,最高级前不用the。
如:The Yellow River is the second longest river in China.黄河是中国第二长河。
（2）形容词最高级在句中作表语而比较范围又不明确时,最高级前不用the。
如: They are happiest on Saturdays.他们在星期六最快乐。
（3）如果两个形容词最高级并列修饰同一个名词时,第二个形容词最高级前不加the。
如:He is the youngest and tallest boy in his class.他是班上年龄最小、个子最高的男孩。
练习形容词比较级和最高级(一）一、写出下列单词的反义词1. hot2.new________3. clean________4. high________5. heavy______6.cold_______7. bad______二、写出下列形容词的比较级和最高级1. old ______ ________2. busy ______ _______3. thin ________ ________4. many _____ _____5. slow ________ _____6. delicious _________ ______三、用适当形式填空：1. Bob is ________ ( young ) than Fred but __________ (tall) than Fred.2. Yingtian is not as ___________ (tall) asYongxian.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 heis 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) thana watermelon.11.Miss Chen is __________ _________than Mr. Wang. (popular)12. Mr. Lin ________ ________ _________ Mr. Brown. (sad)13. The basketball _______ ________ ________ the baseball. (big)14. Question A _______ ________ _________ ________ Question B. (important)15. A rose ________ ________ __________ ________ a weed(野草). (beautiful)16. Toronto is _____ ______ city in Canada. (large)17. Playing computer games is______ _____ _____ of all the activities.(interesting).18. The Nile(尼羅河) is ______ ________river in the world. (long)19. Good health is _______ _______ ________thing life. (important)20. Taking a taxi is ______ _______ way to get to the airport. (easy)21. Test 1 is _____ _______ _________of all the tests. （difficult）22. He is ________than any other boy in the class.（clever）23. She is_______ than all the other students. (young)24. The window is ________ ________ of the two. (narrow)25. Where is the ________bus-stop? (near)26. He is one of ________ ________ _______Politicians. (famous)27. Tom drives much ________ ________than John. (careful)28. The white flower is ________(beautiful). The yellow flower is ______ _______ (beautiful)than the white flower. The red flower is the _____ ______ of the three.四、选择题1. She is ________ than ________ .A. busier / usB. busier / weC. more busy / usD. more busy / we2. Jane is ________ than Betty.A. less tallerB. less tallestC. less tallD. not as tall3. China is ________ country in the world.A. the third largestB. the largest thirdC. the third largeD. a third largest4. -Which is ____ season in Beijing?-I think it's autumn.A.goodB.betterC.bestD.the best5．- Which is__________ , the sun, the moon or the earth?-- Of course, the moon is.A.smallB.smallerC.smallestD.the smallest6.The air in Beijing is getting much _____ now than a few years ago.A. cleanB. cleanerC. cleanestD. the cleanest7. Mobile phones are very popular now and they are _____ than before.A. cheapB. cheaperC. cheapestD. the cheapest8．I study English as_______as my brother.A.hardB. harderC. hardest9. Which is _____ , a bicycle or a computer?A. expensiveB.more expensiveC.the most expensive10. The Yellow River is one of ______rivers in China.A longB longerC the longest11.She is the second _______student in our class.A. tallB. tallerC. talles形容词比较级和最高级（二）一、用括号里的词的适当形式填空。