The comparison of adjectives in English:

To form the comparative of an adjective, English adds -er to shorter words ("prettier") or places more in front of more complicated ones ("more beautiful").

To form the superlative of an adjective, English adds -est ("prettiest") or uses most ("most beautiful").

To form the comparative of an adverb, English adds -er to those that do not end in -ly ("faster") and places more in front of those that do end in -ly ("more quickly").

To form the superlative of an adverb, English adds -est to those that do not end in -ly ("fastest") and places most in front of those that do ("most quickly").

 

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