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1. one syllable = +er

cheaper, colder, higher

2. 1 vowel + 1 consonant = double consonant +er

thinner,sadder

3. 1 or 2 syllables ending in y = y +ier

dirtier, drier, hungrier

4. 2 or more syllables = more + adjective

more difficult, more comfortable

5. irregular

wet, best, worse, farther/further