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2. Comparatives and Superlatives
Comparatives can be either adjectives or adverbs. They are used to compare two persons, things or places. Comparatives are created by adding –er to either an adjective or adverb. Superlatives are used to compare more than two people, things or places, and mostly created by adding –est to adjectives or some adverbs. However, if the word ends in –y, make the comparative by changing the y to i and then add –er or -est
Word Comparative Superlative
clever cleverer cleverest
fat fatter fattest
tall taller tallest
happy happier happiest
hairy hairier hairiest
pretty prettier prettiest

 

Word Comparative Superlative
bad, badly worse worst
beautiful more beautiful most beautiful
far (additional) further furthest
far (distance) farther farthest
good/well better best
intelligent more intelligent most intelligent
kindly kindlier kindliest
little less least
more more most
old (age) older oldest
old (position in family) elder eldest

 

Word Comparative Superlative
sweet (adjective) sweeter sweetest
sweet (adverb) more sweetly most sweetly

 

The common mistake made is adding more to comparative or most to superlative.

EXAMPLE: weaker – more weaker – most weakest (INCORRECT)
  weaker – weaker – weakest (CORRECT)