课前准备：检查学生掌握单词情况（听写）一、形容词、副词的比较级和最高级的构成规则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；（1）单音节词如：small→smaller→smallest short→shorter→shortesttall→taller→tallest great→greater→greatest（2）双音节词如：clever→cleverer→cleverest narrow→narrower→narrowest2．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→heaviestbusy→busier→busiest happy→happier→happiest5．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 beautifuldifferent→more different→most differenteasily→more easily→mo st 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→bestbad→worse→worst ill→worse→worstold→older/elder→oldest/eldestmany/much→more→most little→less→leastfar →further/farther→ furthest/farthest词形变换。
比较级最高级large _________________ ___________________fast _________________ ___________________easy _________________ ___________________wet _________________ ___________________good _________________ ___________________important _________________ ___________________well __________________ ___________________bad _________________ ___________________many _________________ ___________________little _________________ ___________________far _________________ ___________________strong _________________ ___________________patient _________________ ___________________safe _________________ ___________________expensive _________________ ___________________二、形容词、副词的比较级和最高级的句子公式：比较级形容词物体A + am / are / is + 形比 + than + 物体B.I am taller than you.Pasta is more delicious than pizza.副词物体A + 行为动词 + 副比 + than + 物体B.Cheetahs run faster than goats.He studies better than me.最高级1）物体A + am / are / is + the + 形最高级 + 比较范围（of + 人/物，in +地方）.I am the tallest in the class.Pasta is the most delicious food of the three.2）物体A + 行为动词 + 副词最高级 + 比较范围（of + 人/物，in + 地方）. Cheetahs run fastest in the world.He studies best of us.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. tallest用括号里的词的适当形式填空。
1. Tom can jump _______(high). He jumps _______(high) than the other boys inhis class.2. Janet sing _______(well) in her class. She can sing ______(well) than her music teacher, too.3. My father is ______(handsome). But my brother is ________(handsome) than him. He is ______(handsome) in my family.4. I have ______(many) books in my class. But my teacher has _____(many) booksthan ____(I).5.______(they) house is much ______(old) than ______(we).三、形容词和副词比较级的用法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.③ very, quite一般只能修饰原级，不能修饰比较级。
2．“比较级 + and + 比较级”或“more and more +原级”表示“越来越……”如：It becomes warmer and warmer when spring comes.春天来了，天气变得越来越暖和了。
It is getting 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．在含有or的选择疑问句中，如果有两者供选择，前面的形容词要用比较级形式。
如：Who is taller,Tim or Tom? 谁更高，Tim还是Tom?4. “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。