英语中的比较级和过去式到底该怎么改

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比较级的构成规则 1．一般单音节词和少数以-er,-ow结尾的双音节词,比较级在后面加-er,最高级在后面加-est；（1）单音节词如：small→smaller→smallest short→shorter→shortest tall→taller→tallest great→greater→greatest （2）双音节词如：clever→cleverer→cleverest narrow→narrower→narrowest 2．以不发音e结尾的单音节词,比较在原级后加-r,最高级在原级后加-st；如：large→larger→largest nice→nicer→nicest able→abler→ablest 3．在重读闭音节（即：辅音＋元音＋辅音）中,先双写末尾的辅音字母,比较级加-er,最高级加-est；如：big→bigger→biggest hot→hotter→hottest fat→fatter→fattest 4．以“辅音字母＋y”结尾的双音节词,把y改为i,比较级加-er,最高级加-est；如：easy→easier→easiest heavy→heavier→heaviest busy→busier→busiest happy→happier→happiest 5．其他双音节词和多音节词,比较级在前面加more,最高级在前面加most；如：beautiful→more beautiful→most beautiful different→more different→most different easily→more easily→most easily 注意：（1）形容词最高级前通常必须用定冠词 the,副词最高级前可不用.例句：The Sahara is the biggest desert in the world.（2）形容词most前面没有the,不表示最高级的含义,只表示"非常".It is a most important problem.=It is a very important problem.6．有少数形容词、副词的比较级和最高级是不规则的,必须熟记.如：good→better→best well→better→best bad→worse→worst ill→worse→worst old→older/elder→oldest/eldest many/much→more→most little→less→least far →further/farther→ furthest/farthest 过去式的构成规则表示一般过去式的动词通常用动词的过去式形式来表示,而动词的过去式是在动词原形的基础上变化的.动词的过去式可分为规则动词和不规则动词.规则动词的过去式变化如下：（1）一般情况下,动词词尾加 -ed ,如：worked played wanted acted （2）以不发音的 -e 结尾动词,动词词尾加 -d,如：lived moved decided declined hoped judged raised wiped （3）以辅音字母 + y结尾的动词,把-y变为-i 再加-ed,如：studied tried copied justified cried carried embodied emptied （4）以一个辅音字母结尾的重读闭音节动词,双写词尾辅音字母,再加 -ed,如：stopped begged fretted dragged dropped planned dotted dripped （5）注：不规则动词的过去式变化规律性不强,须多加记忆.