In general, comparative and superlative forms of adverbs are the same as for adjectives:
- add -er or -est to short adverbs:
 
| Adverb | Comparative | Superlative | 
|                  hard  |                               harder  |                               the hardest  |            
Example:
- Jim works harder than his brother.
 - Everyone in the race ran fast, but John ran the fastest of all.
 
with adverbs ending in -ly, use more for the comparative and most for the superlative:
| Adverb | Comparative | Superlative | 
|                  quietly  |                               more                  quietly  |                               most                  quietly  |            
Example:
- The teacher spoke more slowly to help us to understand.
 - Could you sing more quietly please?
 
Some adverbs have            irregular comparative forms:
          
| Adverb | Comparative | Superlative | 
|                  badly far little well  |                               worse farther/further less better  |                               worst farthest/furthest least best  |            
- The little boy ran further than his friends.
 - You're driving              worse              today than yesterday !
 
BE CAREFUL! Sometimes 'most' can mean 'very':
- We were most grateful for your help
 - I am most impressed by this application.
 
