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1、-,1,什么是比较级,当我们需要对事物作出比较时，需要用到比较级。比较级的句子结构通常是：（）+动词be(am,is,are)+形容词比较级+than（比）+（）,-,2,Lets read!,形容词的比较级构成,规则变化,不规则变化,-,3,一、形容词、副词的比较级构成的规则变化：1、一般在形容词、副词后加上er表示比较级 原级 比较级 1）small small 2)young young 3)fast fast,er,er,er,-,4,2、以不发音的e结尾的，只加上r表示 比 较级。原级 比较级 1)large large 2)nice nice 3)fine fine,r,r,r,-
2、,5,3、以辅音字母+y 结尾的，把y改为i,然后加上er表示比较级。原级 比较级 1）early early 2)happy happy,ier,ier,-,6,4、重读闭音节结尾、且末尾只有一个辅音字母，双写最后一个辅音字母，然后加上 er表示比较级。原级 比较级 1）big big 2)thin thin3)wet wet 4)fat fat 5)hot hot,ger,ner,ter,ter,ter,-,7,5 部分双音节和多音节的形容词，副词，在这些形容词和副词前加上more表示比较级。原级 比较级 1)expensive expensive 2)careful careful 3)
3、exciting exciting 4)boring boring 5)interesting interesting6)carefully carefully,more,more,more,more,more,more,-,8,二、形容词和副词比较级的不规则变化,better,worse,less,more,fartherfurther,older elder,-,9,三、部分形容词和副词的比较级的特殊情况：,1、某些单音节形容词，加more 构成比较级。glad more glad pleased more pleased tired more tired,-,10,2、有些双音节和单音节
4、形容词，既可以加er构成比较级，也可以加more 构成比较级。friendly friendier more friendly huge huger more huge calm calmer more calm true truer more true clever cleverer more clever,-,11,important easy wet happycareful thin good hot easily many big heavy delicious,练习：写出下列词的比较级,more important,easier,wetter,happier,more carefu
5、l,thinner,better,hotter,more easily,more,bigger,heavier,more delicious,-,12,Which country is larger?,U.S.A,Australia,USA is larger than Australia.,-,13,The Yellow River,Which river is longer?,The Changjian River,The Changjiang River is longer than the Yellow River.,-,14,Linda has longer hair than lu
6、cy.,Lucy,Linda,-,15,（3）“比较级+and+比较级”表示“越来越”eg:In spring,the days are getting longer and longer.春天，天越来越长了。She is more and more athletic.她越来越健壮了。,than 后面接代词时，一般要用主格，但在口语中也可以换成宾格。eg:He is good at math than I(me).他比我更擅长数学。,-,16,（4）“The+比较级，the+比较级”表示“越，就越”eg：The busier he is,the happier he feels.他越忙就越高兴
7、。,（5）形容词比较级前可加数词，表示“大（小）多少”“长（短）多少”eg:He is five years younger than me.他比我小五岁。,（6）表示倍数时用:“times（倍，倍数）+比较级+than”或“times as+原级+as”eg:My room is three times bigger than yours.我的房间比你的大三倍。My room is four times as big as yours.我的房间是你的四倍。,-,17,(8)、用比较级形式表示最高级的意思:比较级+than any other+单数eg:He is taller than an
8、y other boy in his class.,-,18,vegetables,pizza,Which is more delicious,vegetables or pizza?,(9)表示两者之间的选择，可使用“Which who is+比较级，or?”,-,19,Who is more popular,Beckham or Zhao Benshan?,Beckham,Zhao Benshan,-,20,(10)形容词原级的常用句型,Tom is as tall as Mike.汤姆和迈克一样高。,as+形容词原形+as,There are as many students in ou
9、r class as yours.我们班有和你们班一样多的学生。,Tom is as old as Mike.汤姆和迈克一样大。,-,21,否定 not as+形容词原形+as“和 不一样”或 not so+形容词原形+as“不及不如,Lucy is not as tall as Mike.,Lucy is not so tall as Mike.露西没有迈克那样高。,-,22,（二）在比较级前面使用的修饰词有：even（更，更加），a little（有点），far/much/a lot（更加，的多）eg:1.Yesterday was hot,but today is even hotter
10、.2.Im a little taller than Mary.3.This skirt is far/much/a lot more beautiful than that one.,-,23,Follow ups(随堂练习),1、The Changjiang River is _ than any other river in China.A.shorter B.longer C.shortest D.longest2、Bob never does his homework _ Mary.He makes lots of mistakes.A.so careful B.as careful
11、ly as C.carefully as D.as careful as3、_ she is,_ she feels.A.The more busy,the more happy B.The busy,the happy C.Busier,happier D.The busier,the happier4、The weather is getting c_ a_ c_.(越来越冷),-,24,6.In our city its in July,but it is even _in August.A.hotter;hottest B.hot;hot C.hotter;hot D.hot;hott
12、er,7.An elephant is than a tiger.A.Heavy B.very heavy C.the heaviest D.heavier,8.Which subject is _,physics or chemistry?A.interesting B.most interesting C.more interesting D.the most interesting,5.The bread is _ than these cakes A.very delicious B.much delicious C.more delicious D.as delicious,-,25,BBDD CDDC,
