常用的多音节形容词或副词比较级和最高级单音节和部分双音节词比较级和最高级的构成一般是在词尾加er或est,但一般三个音节以上的形容词或副词比较级和最高级要在其前面加more或most来构成。如:interestingmoreinteresting,mostinterestingintelligentmoreintelligent,mostintelligentdangerousmoredangerous,mostdangerousbeautifulmorebeautiful,mostbeautifulcarefulmorecareful,mostcarefulimportantmoreimportant,mostimportant有部分双音节词在前面加more和most:oftenmoreoften,mostoftenmodernmoremodern,mostmodernhelpfulmorehelpful,mosthelpfulseriousmoreserious,mostseriouspatientmorepatient,mostpatient有些双音节词既可以加er,est也可以在前面加more和most:quietquieter,quietest,morequietmostquietclevercleverer,cleverestmoreclever,mostcleversimplesimpler,simplestmoresimple,mostsimple以-ly结尾的副词前面加more,most:slowlymoreslowly,mostslowlyquietlymorequietly,mostquietlyseriouslymoreseriously,mostseriouslycarefullymorecarefully,mostcarefully常用的比较级和最高级famousmorefamousmostfamousexcitedmoreexcitedmostexcitedfriendlymorefriendlymostfriendlypopularmorepopularmostpopulardangerousmoredangerousmostdangerousdifficultmoredifficultmostdifficult