the cat are very clever but michael thinks dogs are than cats的are在句子中的比较急

21．A．It's not very good． B．It's old but nice． C．I don'tThe cat and the dog are asleep in front of it，too．（90) Their

more clever 和 cleverer 都可以
英语的形容词和副词的比较级和*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*
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*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*）
empty , wrong , perfect , unique , extreme , excellent , favourite (GB)/ favorite (GA) , true , right , correct , extremely ...

The cats are very clever but Michael thinks dogs are cleverer than cats.