一般规律是：单音节词的比较级和最高级在词尾加 -er/-est；多音节词在前面加 more 或 most；双音节词如果是典型的形容词词尾，有明显的标示词类的功能，应保留词尾不变，在前面加 more 或 most。其他的双音节词，两种变化都可以
单音节词
单音节的形容词，因为很短，适合在词尾变化(如: tall、taller、tallest)
1、单音节词末尾加 -er 或 -est
high 高的 | higher | highest
slow 慢地 | slower | slowest
2、单音节词末尾如果以 e 结尾，则加 -r 或 -st
late 晚的 | later | latest
wide 广泛地 | wider | widest
3、闭音节单音节词如末尾只有一个辅音字母，须先双写这个辅音字母，再加 -er 或 -est
thin 瘦的 | thinner | thinnest
fit 适合的 | fitter | fittest
4、有些以 -y 结尾的单音节词， -y 前面是辅音时也可以直接加 -er 或 -est
shy 害羞的 | shyer | shyest
sly 狡猾的 | slyer | slyest
wry 讽刺的 | wryer | wryest
多音节词
三个音节以上的多音节词已经很长，不适合再加词尾变化，因而在前面加 more 或 most，表示更(最)...，或者加 less 或 least ，表示更(最)不...
interesting 有趣的 | more interesting | most interesting
important 重要的 | less important | least important
carefully 认真地 | more carefully | most carefully
双音节词
双音节形容词很尴尬:不长不短，怎么判断？
1、词尾是典型的形容词词尾，有明显的标示词类的功能，应保留词尾不变，在前面加 more 或 most
crowded more crowded most crowded
loving more loving most loving
helpful more helpful most helpful
famous more famous most famous
active more active most active
2、其他的双音节形容词，如果不是典型的形容词字尾，变化则无限制，两种变化都可以
often oftener(more often) oftenest(most often)
shallow shallower(more shallow) shallowest(most shallow)
3、如果是 -y 结尾，这个长母音因为发音上的要求，要先变成短母音的 i，再加字尾变化，如：
happy happier happiest
lucky luckier luckiest
二、不规则形式
good/well | better | best
bad/ill/badly | worse | worst
many/much | more | most
little | less | least
far | farther/further | farthest/furthest
old | older/elder | oldest/eldest
三、比较等级
英语中形容词副词有三个比较等级，即原级、比较级和最高级
1、原级
(1) 表示程度相同，即“和...一样...”时用原级，常用 "as... as" 结构
It is as beautiful as paradise in Heaven. 这里如天堂般美丽
This room is as broad as it is long. 那个房间长宽相等
He is as handsome as John (is). 他和约翰一样英俊
He studies as hard as John (does). 他和约翰一样努力
(2) as...as... 引导的结构可采用倒装句型
He studies as hard as John (does). = He studies as hard as does John.
He is as handsome as John is. = He is as handsome as is John.
(3) 否定的原级用 as 或as，二者区别不大
You are not as tall as he. 你没有他高
Guangzhou is not as clean as Shanghai. 广州没有上海那么干净
I didn't do so well as I should. 我做得不如我应做得那么好noise的形容词
(4) as... 结构前可以用 just、quite、almost、nearly、half 等词在程度上加以修饰
This story was quite as interesting as we had thought. 这个故事和我们想的一样精彩
The bike is not half so new as mine. 这辆自行车还没我的一半新
She can read twice as fast as he does. 她的阅读速度比他快一倍
John is not quite as good a student as his sister.
连接词 as 表示这是组 as..as 的比较级。强调语气时可用 quite as..as，表示“完全一样”，否定是 not as。not quite as good 放在一起，成为形容词短语后，不能再放在 a student 之间的位置，只好移到前面
(5) as many/much as 多达...
As many as twenty students have passed the test. 这次考试及格的同学多达 20 人
We spent as much as 20,000 yuan on the trip. 这趟旅行我们花了多达两万元
(6) 表示程度相同，除了使用"as...as..."还可以使用equal(ly)、same、enough、as...等
We finished the task for an equally long time. 我们完成这项任务的时间一样长
We are about the same age. 我们大约同龄
It's satisfactory enough. 这已经足够令人满意了
I have exactly the same car as that one. 我有一辆车，跟那一辆完全相同
(7) as ... as one can = as ... as possible 尽量
He tried as hard as he could to please her. 他使出浑身解数取悦她
= He tried as hard as possible to please her
You should be as careful as you can in dealing with such problems. 处理这样的问题时你应尽量小心
= You should be as careful as possible in dealing with such problems.
2、比较级
(1) 将程度不同的二者进行比较，即表示“比...更(还)...”时用比较级，常用 "比较级 + than" 结构
Oil is lighter than water. 油比水轻
Action speaks louder than words. 行动用于言辞
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