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一、在词尾加-er和–est原级比较级；表示更…最高级;表示最…short矮的shortershortesttall高的tallertallestlight轻的lighterlighteststrong强壮的strongerstrongestweak弱的weakerweakestslow慢的slowerslowestfast快的fasterfastestyoung年轻的youngeryoungestold老的，旧的olderoldestloud大声的louderloudestlong长的longerlongestsmall小的smallersmallestnew新的newernewestcold冷的coldercoldestbright明亮的brighterbrightestsmart聪明的smartersmartestkind友好度kinderkindestsweet甜的sweetersweetestthick厚的thickerthickestclean干净的cleanercleanestclever聪明的cleverercleverest三、辅音加y结尾的，变y为i,再加–er或–est原级比较级最高级healthy健康的healthierhealthiestheavy重的heavierheaviestlazy懒的lazierlaziesteasy容易的easiereasiestsalty咸的saltiersaltiestnoisy吵闹的noisiernoisiest二、以-e结尾的只加–r和–st原级比较级最高级late迟到laterlatestlarge大的largerlargestbrave勇敢的braverbravestfunny有趣的funnierfunniestnaughty调皮的naughtiernaughtiestpretty可爱的prettierprettiestearly早的earlierearliestdirty脏的dirtierdirtiest四、双写辅音字母再加-er和-est原级比较级最高级hot热的hotterhottestbig大的biggerbiggestfat肥的fatterfattestthin瘦的thinnerthinnestwet湿的wetterwettest六、不规则变化原级比较级最高级good/well好的betterbestbad/ill坏/的worseworstmany/much许多的moremostfar远的farther/furtherfarthest/furthestlittle小的lessleastold老的，旧的Older/elderOldest/eldest五、双音节词和多音节词都加–more或–most原级比较级最高级important重要的moreimportantthemostimportantdangerous危险的moredangerousthemostdangeroushonest诚实morehonestthemosthonestbeautiful漂亮的morebeautifulthemostbeautifulfamous著名的morefamousthemostfamousinteresting有趣的moreinterestingthemostinterestingexciting令人兴奋的moreexcitingthemostexcitingdelicious美味的moredeliciousthemostdeliciousdifficult困难的moredifficultthemostdifficult