小学形容词的比较级和最高级ppt课件.pptx

形容词的比较级和最高级,形容词有三个形式：,原形,最高级,比较级,cleaner更干净的,clean干净的,cleanest最干净的,一、形容词的比较级和最高级变化规则,比较级和最高级变化规则（1）：,1. 一般的单音节词/少数的双音节词：,比较级：词尾+er,最高级：词尾+est,tall-taller-tallestclever-cleverer-cleverest,比较级和最高级变化规则（2）：,2. 以e结尾的单词：,比较级：词尾+r,最高级：词尾+st,large-larger-largestsafe-safer-safest,比较级和最高级变化规则（3）：,3. 以辅音字母+y结尾的单词：,比较级：y变i+er,最高级：y变i+est,easy-easier-easiesthappy-happier-happiest,比较级和最高级变化规则（4）：,4. 以重读闭音节结尾，而且只有一个辅音字母的单词：,比较级：双写辅音字母+er,最高级：双写辅音字母+est,big-bigger-biggiesthot-hotter-hottiest,比较级和最高级变化规则（5）：,5. 由两个或两个以上音节构成的单词：,比较级：词前+more,最高级：词前+most,expensive more expensive most expensive,beautiful more beautiful most beautiful,6：不规则变化：需要单独记忆,二、形容词比较等级的用法,1. 原级的用法： 用于二者的比较,肯定结构：as+形容词原级+as，意为“和.一样”。Jim is as tall as his father.否定结构：not as+形容词原级+as， not so+形容词原级+as，意为“不如.”。Jim is not as/so tall as his father.My English is not as good as Mary.,2. 比较级的用法：用于二者的比较,结构：比较级+than，意为“比.更.”。Sam is taller than Jim.This picture is more beautiful than that one.,3. 最高级的用法：用于3者或以上的比较,结构：the+最高级+比较范围，意为“最.”。Sam is the tallest student in the class.This is the most beautiful place in the world.,写出下列句子,1. 苹果比西瓜小。2.Peter 比Jim 高。3.直尺比铅笔长。4.铅笔比直尺短。,Apple is smaller than watermelon.,Peter is taller than Jim.,Ruler is longer than pencil.,Pencil is shorter than ruler.,5. 兔子比乌龟慢。6.Tony比Lucy强壮。7.老虎比小狗大。8.吉普车比自行车快。,Rabbit is quicker than turtle.,Tony is stronger than Lucy.,Tiger is bigger than dog.,Jeep is quicker than bike.,9. 迈克是班里最聪明的男孩。10.玛丽是家里最快乐的孩子。11.这是铅笔盒里最长的铅笔。12.这是世界上最美味的食物。,Mike is the cleverest boy in the class.,Mary is the happiest child in the family.,This is the longest pencil in the pencilcase,This is the most delicious food in the world.,谢谢大家,