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：smallsmallersmallest shortshortershortest talltallertallest greatgreatergreatest（2）双音节词如：clevercleverercleverest narrownarrowernarrowest 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：largelargerlargest nicenicernicest ableablerablest3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：bigbiggerbiggest hothotterhottest fatfatterfattest4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：easyeasiereasiest heavyheavierheaviest busybusierbusiest happyhappierhappiest5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：beautifulmore beautifulmost beautifuldifferentmore differentmost different easilymore easilymost 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：goodbetterbest wellbetterbestbadworseworst illworseworstoldolder/elderoldest/eldest many/muchmoremost littlelessleast far 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 / us B. busier / we C. more busy / us D. more busy / we2. Jane is _ than Betty. A. less taller B. less tallest C. less tall D. not as tall3. China is _ country in the world. A. the third largest B. the largest third C. the third large D. a third largest4. -Which is _ season in Beijing?-I think its autumn.A.good B.better C.best D.the best5- Which is_ , the sun, the moon or the earth?- Of course, the moon is.A.small B.smaller C.smallest D.the smallest6.The air in Beijing is getting much _ now than a few years ago.A. clean B. cleaner C. cleanest D. the cleanest7. Mobile phones are very popular now and they are _ than before.A. cheap B. cheaper C. cheapest D. the cheapest8I study English as_as my brother.A.hard B. harder C. hardest9. Which is _ , a bicycle or a computer?A. expensive B.more expensive C.the most expensive10. The Yellow River is one of _rivers in China. A long B longer C the longest11.She is the second _student in our class. A. tall B. taller C. 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) books than _(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： 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。 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. 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