1. 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.双写最后一个字母，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 clo（接近的）—clor—clost 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
wi（睿智的，聪明的）—wir—wist white（白的）—whiter—whitest
4.以字母y结尾的形容词，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 health
y（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
5.双音节、多音节形容词，在单词前面加上 “more” “most” 构成比较级、最高级： afraid（害怕的）—more afraid—most afraid
beautiful（美丽的）—more beautiful—most beautiful c
areful（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）—more 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：
bad（坏的）—wor—worst
far（远的）—farther—farthest (far—further—furthest)
good（好的）—better—best ill（病的）—wor—worst little（少的）—less—least many（多的）—more—most much（多的）—more—most well（好的，身体好的）—better—best old（年老的）—older—oldest ( old—elder—eldest)
