| 构成法 | 原级 | 比较级 | 最高级 |
| 一般单音节词未尾加-er,-est | tall | taller | tallest |
| 以不发音的e结尾的单音词和少数以- le结尾的双音节词只加-r,-st | nice | nicer | nicest |
| 以一个辅音字母结尾的闭音节单音节词，双写结尾的辅音字母，再加-er,-est | big | bigger | biggest |
| "以辅音字母+y"结尾的双音节词，改y为i，再加-er，-est | busy | busier | busiest |
| 少数以-er,-ow结尾的双音节词未尾加-er,-est | clever/narrow | cleverer/ narrower | cleverest/ narrowest |
| 其他双音节词和多音节词，在前面加more，most来构成比较级和最高级 | important/ easily | more important/ more easily | most important/ most easily |
| 原级 | 比较级 | 最高级 |
| good | better | best |
| well（健康的） | worse | worst |
| bad | ||
| ill（有病的） | ||
| old | older/elder | oldest/eldest |
| much/many | more | most |
| little | less | least |
| far | farther/further | farthest/furthest |
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