大多数形容词（性质形容词）和副词有比较级和最高级的变化，即原级、比较级和最高级，用来表示事物的等级差别。原级即形容词的原形，比较级和最高级有规则变化和不规则变化两种。 1) 规则变化 单音节词和少数双音节词，加词尾-er，-est 来构成比较级和最高级。 构成法 原级 比较级 最高级 一般单音节词 tall(高的) taller tallest 未尾加-er,-est great(巨大的) greater greatest 以不发音的e 结尾 nice(好的) nicer nicest 的单音词和少数 large(大的) larger largest 以- le 结尾的双 able（有能力的) abler ablest 音节词只加-r,-st 以一个辅音字母 big(大的) bigger biggest 结尾的闭音节单 hot 热的) hotter hottest 音节词，双写结 尾的辅音字母， 再加-er，-est "以辅音字母+y" easy(容易的) easier easiest 结尾的双音节词，busy(忙的) busier busiest 改 y为 i，再加 -er，-est 少数以-er，-ow clever(聪明的) cleverer cleverest 结尾的双音节词 narrow(窄的) narrower narrowest 未尾加-er，-est 其他双音节词和 important(重要的) 多音节词，在前 more important 面加 more，most most important 来构成比较级和 easily(容易地) 最高级。 more easily most easily 2) 不规则变化 原级 比较级 最高级 good(好的)/ better best well(健康的) bad (坏的)/ worse worst ill(有病的) old (老的) older/elder oldest/eldest much/many(多的) more most little(少的) less least far (远的) farther/further farthest/furthest as + 形容词或副词原级 + as 1）在否定句或疑问句中可用so… as。 He cannot run so/as fast as you. 2）当 as… as 中间有名词时采用以下格式。 as +形容词+ a +单数名词 as + many/much +名词 This is as good an example as the other is. I can carry as much paper as you can.. 3）用表示倍数的词或其他程度副词做修饰语时，放在as 的前面。 This room is twice as big as that one. Your room is the same size as mine. 4) 倍数+ as + adj. + as <=> 倍数+ then + of This bridge is three times as long as that one. This bridge is three times the length of that one. Your room ...
