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An adverb is a word, which modifies a verb an adjective or another verb.
Example: 
Please sit here! ( the adverb here modifies the verb ‘sit’). 
She is very happy. ( the adverb very modifies the adjective ‘happy’)
Adverbs are used to tell: time (when), place (where), reason (why), manner (how), degree( how much), to what extent and frequency (how often).
Example: 
They will leave soon. 
Therefore he was punished.
Many adverb are formed from adjective, with the addition of the suffix “ly”.
Ex: busy – busily |  great – greatly | soft – softly
Adverb In Comparisson.
a. add ‘er’ ,’est’
| Possitive | Comparative | Superlative|
 Fast                 Faster               fastest
 High                higher               highest
b. add ‘more’ , ‘most’
| Possitive                      | Comparative               | Superlative                 |
  Quickly                        more quickly                  most quickly
  Generously                   more generously            most generously
c. irregular comparison
| Possitive | Comparative | Superlative|
  Well               better               best      
  Much             more                most
  Little               less                   least
 
