在对两个或以上的人或物进行对比时,则要使用比较或最高级形式.构成如下：
一） 一般在词后加er或est(如果是以e结尾则直接加r或st).
如：greater-greatest,shorter –shortest,taller –tallest,longer –longest,nicer- nicest,larger -largest
二） 以重读闭音节结尾且1个元音字母＋1个辅音字母(字母组合除外,如few-fewer fewest)结尾的双写结尾的辅音再加er /est.
如：big-bigger biggest,red-redder reddest,hot-hotter hottest
三） 以辅音字母＋y结尾的变y为i加er/est.
如：happy-happier happiest,busy-busier busiest,easy-easier easiest
四）特殊情况：(两好多坏,一少老远)
good/well - better best； many/much - more most； bad/ill – worse worst；
little- less least； old- older/elder oldest/eldest；
far- farther/further farthest/furthest
练习：
1.Bob is ________( young )than Fred but__________(tall) than Fred.
2.He is ______ (bad) at learning maths.He is much _______ (bad) at Chinese and he is the _________ (bad) at English.
3.Annie says Sally is the ________ (kind) person in the world.
4 A dictionary is much _________ (expensive) than a story-book.
5.An orange ia a little ______ (big) than an apple,but much ________ (small) than a watermelon.
6.Playing computer games is______ _____ _____ of all the activities.(interesting).
7.The Nile(尼罗河) is ______ ________river in the world.(long)
8.Good health is _______ _______ ________thing life.(important)
9.Taking a taxi is ______ _______ way to get to the airport.(easy)
10.She is_______ than all the other students.(young)
11.Where is the ________bus-stop?(near)
12.Tom drives much ________ ________than John.(careful)
13.The white flower is ________(beautiful).The yellow flower is ______ _______ (beautiful)than the white flower.The red flower is the _____ ______ of the three.