单音节与少数双音节的副词词尾加-er 构成比较级，加-est构成最高级。
| 原级 | 比较级 | 最高级 |
|---|---|---|
| fast | faster | fastest |
| hard | harder | hardest |
| high | higher | highest |
| late | later | latest |
| near | nearer | nearest |
| soon | sooner | soonest |
| well | better | best |
大多数双音节和多音节副词及词尾为-ly的副词，通常加more, most。
| 原级 | 比较级 | 最高级 |
|---|---|---|
| bravely | more bravely | most bravely |
| cleverly | more cleverly | most cleverly |
| gladly | more gladly | most gladly |
| hopefully | more hopefully | most hopefully |
有一些副词的比较级和最高级构成是不规则的。
| 原级 | 比较级 | 最高级 |
|---|---|---|
| poorly/badly | worse | worst |
| far | farther/further | farthest/furthest |
| late | later | latest |
| much | more | most |
| well | better | best |