单音节词和部分双音节词的变化规则
1.一般情况下，在形容词词尾加上“er”“est”构成比较级、最高级
bright（明亮的）—brighter—brightest
broad（广阔的）—broader—broadest
cheap（便宜的）—cheaper—cheapest
clean（干净的）—cleaner—cleanest
clever（聪明的）—cleverer—cleverest
cold（寒冷的）—colder—coldest
cool（凉的）—cooler—coolest
dark（黑暗的）—darker—darkest
dear（贵的）—dearer—dearest
deep（深的）—deeper—deepest
fast（迅速的）—faster—fastest
few（少的）—fewer—fewest
great（伟大的）—greater—greatest
hard（困难的,硬的）—harder—hardest
high（高的）—higher—highest
kind（善良的）—kinder—kindest
light（轻的）—lighter—lightest
long（长的）—longer—longest
loud（响亮的）—louder—loudest
low（低的）—lower—lowest
near（近的）—nearer—nearest
new（新的）—newer—newest
poor（穷的）—poorer—poorest
quick（快的）—quicker—quickest
quiet（安静的）—quieter—quietest
rich（富裕的）—richer—richest
short（短的）—shorter—shortest
slow（慢的）—slower—slowest
small（小的）—smaller—smallest
smart（聪明的）—smarter—smartest
soft（柔软的）—softer—softest
strong（强壮的）—stronger—strongest
sweet（甜的）—sweeter—sweetest
tall（高的）-taller-tallest
thick（厚的）—thicker—thickest
warm（温暖的）—warmer—warmest
weak（弱的）—weaker—weakest
young（年轻的）—younger—youngest
2.重读闭音节词词尾只有一个辅音字母时，先双写该辅音字母,再加上“er” “est”构成比较级、最高级：
big（大的）—bigger—biggest
fat（胖的）—fatter—fattest
hot（热的）—hotter—hottest
red（红的）—redder—reddest
sad（伤心的）—sadder—saddest
thin（瘦的）—thinner—thinnest
wet（湿的）—wetter—wettest
mad（疯的）—madder—maddest
3.以不发音的字母e结尾的形容词,加上“r” “st” 构成比较级、最高级：
able（能干的）—abler—ablest
brave（勇敢的）—braver—bravest
close（接近的）—closer—closest
fine（好的,完美的）—finer—finest
large（巨大的）—larger—largest
late（迟的）—later—latest
nice（好的）—nicer—nicest ripe（成熟的）—riper—ripest
rude（粗鲁的）—ruder—rudest
safe（安全的）—safer—safest
strange（奇怪的）—stranger—strangest
wide（宽广的）—wider—widest
wise（睿智的,聪明的）—wiser—wisest
white（白的）—whiter—whitest
4.以字母“辅音字母+y”结尾的双音节词,把y改为i,再加上“er”“est”构成比较级、最高级：
busy（忙碌的）—busier—busiest
dirty（脏的）—dirtier—dirtiest
dry（干燥的）—drier—driest
early（早的）—earlier—earliest
easy（容易的）—easier—easiest
friendly（友好的）—friendlier—friendliest
funny（好玩的）—funnier—funniest
happy（开心的）—happier—happiest
healthy（健康的）—healthier—healthiest
heavy（重的）—heavier—heaviest
hungry（饿的）—hungrier—hungriest
lazy（懒惰的）—lazier—laziest
lucky（幸运的）—luckier—luckiest
naughty（调皮的）—naughtier—naughtiest
noisy（嘈杂的）—noisier—noisiest
pretty（美丽的）—prettier—prettiest
silly（傻的）—sillier—silliest
spicy（辣的）—spicier—spiciest
thirsty（渴的）—thirstier—thirstiest
ugly（丑的）—uglier—ugliest
部分双音节词和多音节词的变化规律
5.在单词前面加上“more” 或“most”构成比较级或最高级：
afraid（害怕的）—more afraid—most afraid
beautiful（美丽的）—more beautiful—most beautiful
careful（仔细的）—more careful—most careful
cheerful（开心的）—more cheerful—most cheerful
crowded（拥挤的）—more crowded—most crowded
dangerous（危险的）—more dangerous—most dangerous
delicious（美味的）—more delicious—most delicious
difficult（困难的）—more difficult—most difficult
exciting（令人兴奋的）—more exciting—most exciting
expensive（昂贵的）—more expensive—most expensive
famous（著名的）—more famous—most famous
frightened（受惊的）—more frightened—most frightened
frightening（令人害怕的）—more frightening—most frightening
hard-working（勤奋的）—more hard-working—most hard-working
helpful（有帮助的）—more helpful—most helpful
honest（诚实的）—more honest—most honest
important（重要的）—important—most important
interesting（有趣的）—more interesting—most interesting
polite（有礼貌的）—more polite—most polite
terrible（可怕的）—more terrible—most terrible
tired（累的）—more tired—most tired
6.不规则变化的形容词和副词：
bad（坏的）—worse—worst
far（远的）—farther—farthest (far—further—furthest)
good（好的）—better—best
ill（病的）—worse—worst
little（少的）—less—least
many（多的）—more—most
much（多的）—more—most
old（年老的）—older—oldest ( old—elder—eldest)
well（好的,身体好的）—better—best
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