一：变化方法：
1 在单音节形容词和部分以-er , -ow , -ble , -ple 结尾的双音节词后面直接+er；+est
例：warm → warmer → warmest high → higher →highest
slow → slower → slowest able → abler → ablest
simple → simpler → simplest
2 形容词，副词以e结尾时→+r；+st
例：nice → nicer → nicest
large → larger → largest
3 形容词，副词以辅音+y结尾时→变y为i+er；+est
例：busy → busier → busiest happy → happier → happiest
**** shy → shier → shiest / shyer → shyest
sly → slier → sliest / slyer → slyest
4 以一个辅音字母结尾的重读闭音节的形容词或副词→双写词尾字母再+er；+est
例：hot → hotter → hottest big → bigger → biggest
5 多音节词（3个或3个以上音节）和部分双音节的词在前面加→ more～；most～
例：beautiful → more beautiful → most beautiful
useful → more useful → most useful
famous → more famous → most famous
6 不规则变化：
原级 比较级 最高级
good ∕well better best
many / much more most
bad∕badly∕ill worse worst
little less least
far ① farther
② further ① farthest
② furthest
old （GA）older
（GB）①older
（GB）②elder （GA）oldest
（GB）①oldest
（GB）②eldest
7 特殊情况：
⑴下列各词无比较级和最高级：
wrong right correct true empty perfect excellent unique extreme extremely ready possible possibly chief main mainly final sufficient fatal primary absolute absolutely entire entirely infinite naked favorite
⑵下列单音节词变比较级和最高级时在前面加more～；most～
累的：tired → more tired → most tired
高兴的：glad → more glad → most glad
无聊的：bored → more bored → most bored
喜欢的：fond → more fond → most fond
高兴的，愉快的：pleased → more pleased → most pleased
用旧的，用坏的：worn → more worn → most worn
真的，真实的：real → more real → most real
⑶下列瓷即可以直接+er；+est，又可以more～；most～
聪明的（a.）clever → cleverer → clevest
more clever → most clever
经常（ad.）often → oftener → oftenest
more often → most often
残酷的（a.）cruel → crueler → cruelest
more sruel → most cruel
严厉的（a.）strict → stricter → strictest
more strict → most strict
友好的（a.）friendly → friendlier → friendliest
more friendly → most friendly
安全的，可靠的
（a.）secure → securer → securest
more secure → most secure
有名的，众所周知的
（a.） well-known → better-known → best-known
more well-known → most well-known