第三课时　Section A (Grammar Focus－4c).ppt

人教版八年级下册,英语,Unit 7Whats the highest mountain in the world,Section A(Grammar Focus4c),单词展示,ocean,n.大海；海洋,the Pacific Ocean,n.太平洋,生成新知,形容词、副词的比较级和最高级,概述：英语中的形容词和副词常用三种形式来表达事物的等级差别，即原级、比较级和最高级。比较级主要用于两者之间作比较。最高级主要用于三者或三者以上进行比较。,1形容词比较级的句型结构,(1)形容词的比较级than比较对象。前后相比较的两个事物一定要属于同类，而且作比较时，一定要避免自身与自身相比。表示一个范围内两事物比较，用“比较级thanany other单数名词”。,如：He is more careful than any other student in his class.他比班上任何一个学生都认真。,(2)asas意为“与一样”，其否定形式为“not so/asas”，意为“不及；不与一样”。,它们也是一种表达比较的形式，注意as与as之间要用形容词或副词的原级。,2比较级的特殊句型,比较级前可以用much，a little，a bit，even等修饰。,如：The shoes are a little bigger for me.对我来说，这双鞋有点儿大。,【注意】当比较级后有of the two之类的短语时，比较级前要加定冠词the。,在选择疑问句中两者进行比较，常用句型：Which/When/Whobe形容词比较级，A or B?,3形容词最高级的句型结构,4最高级的特殊句型,“主语bethe形容词最高级in/of范围”表示“在某范围内最”。,(1)形容词最高级前通常要加定冠词the。但前面若有物主代词、指示代词或名词所有格等修饰时，不能用定冠词the。,【注意】,(2)形容词最高级常与介词in或of引导的短语连用，与in连用意为“在内”，表示“在某范围内”，不一定是同类；与of连用表示“属性”，介词后的名词或代词与句中的主语是同一类人或物，意为“在某一类中”。,Fill in the blanks with the correct forms of the words in the box.,big much popular long old high,1.The Amazon River is one of the _ rivers in the world.Its a little _ than the Yangtze River.,longest,longer,big much popular long old high,2.Qomolangma is 8,848.86 meters _.Its one of the most _ places for serious mountain climbers.,3.No ocean in the world is as _ as the Pacific Ocean.4.Although Japan is _ than Canada,it is _ smaller.,high,popular,big,older,much,Write two comparisons about two topics.Write true facts.,Two rivers:_ and _,the Yangtze River,the Amazon River,The Amazon is longer than the Yangtze,but the Yangtze is,The Yangtze River is almost as long as the Amazon River.,the longest river in China.,Two cities:_ and _1._.2._ _.,Shanghai,Shanghai is as modern as Sydney,Shanghai is much smaller than Sydney.Sydney is,Sydney,almost 2 times as big as Shanghai,Two animals:_ and _1._.2._ _.,a fish,A shark is bigger than a fish.,A fish is smaller than a shark.A shark eats,a shark,more than a fish.,Write five questions using comparisons.Then ask your partner your questions.,1._2._3._4._5._,What is the highest building in our city?,What is the biggest supermarket in our city?,Who is the tallest student in our class?,Who is the shortest student in our class?,Who sings the best in our class?,随堂练习,I.用括号内所给单词的正确形式填空。,1.He is happy with his _(achieve).2.The _(force)of rainstorm made the windows broken.,achievement,forces,3.After she worked hard at it for three hours,she _(successful)in solving the problem.4.Everyone should drive more carefully in the _(freeze)weather.,succeeded,freezing,II.单项选择。()1.His books are _more than mine.Amany time Bmore timeCsome time Dmany times()2.I know _about Shenzhen than you，so tell me some，please.Alittle BSome Cmuch Dless,D,D,()3.The Great Wall is more than _A6，000 kilometer longB6，000 kilometers longC6，000kilometers longD6，000 kilometer longer()4.What bad weather!The radio says it will be even _ later on.Abad BbadlyCworse Dworst,B,C,见学生用书,布置作业,