如何判断形容词的比较级和最高级呢？
形容词比较级、最高级的构成一、 规则变化
1.单音节词和少数双音节词
（1）一般情况在原级词尾加-er构成比较级,加-est构成最高级.如：high→higher→highest.
（2）以e结尾的词,直接加-r 或-st.如：large→larger→largest.
（3）重读闭音节,末尾只有一个元音字母加一个辅音字母的词,先双写这一辅音字母再加-er或 -est.如：big→bigger→biggest.
（4）以“辅音字母 + y”结尾的词,先变 “y”为 “i”,再加-er 或-est.如：happy→happier→happiest.
2.大部分双音节词和所有多音节词
在原级前加more构成比较级,加most构成最高级.如：dangerous→more dangerous→the most dangerous.
二、 不规则变化
有一些词的比较级、最高级变化是不规则的,需要特殊记忆.如：
good / well→better→best
bad / ill→worse→worst
many / much→more→most
little→less→least
far→farther→farthest(表示距离) / far→further→furthest (表示程度)
old→older / elder→oldest (表示新旧或年龄) / eldest (表示兄弟姐妹之间的长幼关系)
三、 一些词的比较级和最高级,可以加-er或 -est,也可以加more或most,如：clever,polite等.
四、一些词本身没有比较级和最高级形式,如：right,wrong,full,empty,round,complete,wooden,dead,daily等.
形容词比较级的用法
1.两者比较时用形容词比较级,其结构为“...比较级 + than ...”.如：Actions speak louder than words.
2.在两者之间选择“哪一个更……”e799bee5baa6e79fa5e98193e59b9ee7ad9431333361303565时,用句型 “Which / Who is +比较级,...or ...”.如：Which sweater is cheaper,the red one or the yellow one?
3.表示“两者之间最……的一个”时,用“the + 比较级”.如：Lucy is the taller of the twins.
4.表示“越……,越……”时,用“the + 比较级,the + 比较级”.如：The more you eat,the fatter you will become.
5.表示“越来越……”时,用“比较级 + and + 比较级”,多音节词和部分双音节词用“more and more + 形容词原级”.如：We should make our country more and more beautiful.
6.形容词比较级前可以用下列词修饰：much,a little,far,a bit,a few,a lot,even,still,rather等.如：It's much colder today than yesterday.
形容词最高级的用法
1.三者或三者以上的人或物进行比较时,用形容词最高级形式.形容词最高级前通常需加定冠词the,句末常接in / of短语来表示范围.如：He is the strongest of all the boys.
2.表示“最……之一”时,用 “one of + the + 最高级”.如：The light bulb is one of the most helpful inventions.
3.形容词最高级前可以由物主代词、指示代词、名词所有格等修饰,此时不用定冠词the.如：Yesterday is her happiest day in her life.
形容词比较级和最高级的变化规则：
1、 一般直接在词尾加 er/est: 如 tall—taller—tallest.
great strong quick long fresh few tall
2、 以 e 结尾的单词直接加-r/-st,如 wide—wider—widest.
nice brave fine strange late wide
3、 以辅音字母加 y 结尾的单词，把 y 变为 i，再加 er/est:
如 busy—busier—busiest.
lazy ugly happy lucky healthy busy
4、 以重读闭音节结尾且末尾只有一个辅音字母的单词，
双写末尾的辅音字母，再加 er/est: 如 big—bigger—biggest.
fat red thin hot wet
5、 部分双音节词，多音节词在词前面加 more 或 most
比较级: more + adj； 最高级: most + adj：
如 serious—more
serious—most serious.
interesting delicious carefully popular careful useful
dangerous beautiful important terrible active serious
6、 不规则变化：
good / well—better—best.
bad / ill—worse—worst.
many / much—more—most.
little / few—less—least.
far—farther / further—farthest / furthest.
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