With adverbs ending in -ly, you must use more to form the comparative, and most to form the superlative.
|quietly||more quietly||most quietly|
|slowly||more slowly||most slowly|
|seriously||more seriously||most seriously|
- The teacher spoke more slowly to help us to understand.
- Could you sing more quietly please?
With short adverbs that do not end in -ly comparative and superlative forms are identical to adjectives: add -er to form the comparative and -est to form the superlative. If the adverb ends in e, remove it before adding the ending.
- Jim works harder than his brother.
- Everyone in the race ran fast, but John ran the fastest of all.
Some adverbs have irregular comparative and superlative forms.
- The little boy ran farther than his friends.
- You're driving worse today than yesterday !
- He played the best of any player.