more clever 和 cleverer 都可以
英语的形容词和副词的比较级和最高级的构成
一 规则变化
1 单音节以及少数双音节的词,后面直接加 -er ,-est
2以-e结尾的,在后面加-r ,-st
3以辅音字母＋y结尾的词,把y变成i,再加-er ,-est
[注〕
shy ---- shyer ,shyest / shier ,shiest
4重读闭音节的词,要双写词尾字母,再加-er ,-est
5多音节的词,要在前面加 more-,most-
〔注〕
少数单音节词前面加 more-,most- 构成比较级和最高级
tired ---- more tired ,most tired
fond ----- more fond ,most fond
glad ----- more glad ,most glad
bored ---- more bored ,most bored
pleased---- more pleased ,most pleased
二不规则变化
good /well------- better ,best
bad/badly/ill------ worse ,worst
many/much-------more ,most
little ------ less ,least
far ---- farther,farthes / firther ,furthest
old ---- older ,oldest (GA)
---- older ,oldest / elder ,eldest (GB)
三下列形容词和副词的比较级和最高级有两种形式
cruel----- crueler,cruelest /
more cruel ,most cruel
strict---- stricter ,strictest /
more strict ,most strict
often----- oftener ,oftenest /
more often ,most often
friendly------ friendlier ,friendliest /
more friendly ,most friendly
clever----- cleverer,cleverest /
more clever ,most clever
四 下列形容词和副词没有比较级和最高（即表示”最高程度”或”绝对状态”的形容词和副词没有比较级和最高级）
empty ,wrong ,perfect ,unique ,extreme ,excellent ,favourite (GB)/ favorite (GA) ,true ,right ,correct ,extremely ...
