一、一般情况下（单音节以及部分双音节）加er或est

small→smaller→smallest     tall→taller→tallest

hard→harder→hardest      fast→faster→fastest

cold→colder→coldest       warm→warmer→warmest

clear→clearer→clearest     quick→quicker→quickest

sad→sader→sadest          loud→louder→loudest

strong→stronger→strongest  short→shorter→shortest

great→greater→greatest     few→fewer→fewest

clever→cleverer→cleverest   quiet→quieter→quietest

二、以不发音的字母e结尾（单音节）加r或st

large→larger→largest        nice→nicer→nicest

safe→safer→safest           fine→finer→finest

late→later→latest            wide→wider→widest

simple→simpler→simplest

strange→stranger→strangest

三、一个元音加一个辅音字母结尾，双写辅音加er或est

fat→fatter→fattest           

thin→thinner→thinnest

slim→slimmer→slimmest     

wet→wetter→wettest

big→bigger→biggest         

red→redder→reddest

hot→hotter→hottest         

fit→fitter→fittest

四、辅音字母加y结尾，变y为i加er或est

easy→easier→easiest         angry→angrier→angriest

busy→busier→busiest         heavy→heavier→heaviest

hungry→hungrier→hungriest  crazy→crazier→craziest

happy→happier→happiest     early→earlier→earliest

dirty→dirtier→dirtiest        lucky→luckier→luckiest

shy→shier→shiest           funny→funnier→funniest

lovely→lovelier→loveliest friendly→friendlier→friendliest

五、双音节以及多音节词前加more或most

outgoing→more outgoing→most outgoing

beautiful→more beautiful→most beautiful

different→more different→most different

quietly→more quietly→most quietly

loudly→more loudly→most loudly

slowly→more slowly→most slowly

quickly→more quickly→most quickly

sadly→more sadly→most sadly

happily→more happily→most happily

carefully→more carefully→most carefully

serious→more serious→most serious

similar→more similar→most similar

easily→more easily→most easily

clearly→more clearly→most clearly

bored→more bored→most bored

talented→more talented→most talented

boring→more boring→most boring

popular→more popular→most popular

terrible→more terrible→most terrible

delicious→more delicious→most delicious

different→more different→most different

difficult→more difficult→most difficult

beautiful→more beautiful→most beautiful

expensive→more expensive→most expensive

necessary→more necessary→most necessary

important→more important→most important

wonderful→more wonderful→most wonderful

comfortable→more comfortable→most comfortable

hardworking→more hardworking→most hardworking

不规则adj、adv比较级、最高级

good/well→better→best

bad/badly/ill→worse→worst

many/much→more→most

few/little→less→least

old→older/elder→oldest/eldest

far→farther/further→farthest/furthest

无比较级的adj/adv

fantastic excellent favorite true(ly) false right wrong 

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