we make comparatives and superlatives in the following way;
we add -er/-est to adjectives/adverbs with one or two syllables.
the last consonant is doubled for one syllable adjectives/adverbs with consonant-vowel- consonant.
for one or two syllable adjectives/adverbs that end in -y. the y changes to / and then we add -er/-est.
we use more/most or less/least with adjectives/adverbs of more than two syllables.