Comparatives of adjectives are formed with -er or with more. Superlatives are formed with -est or with most. Comparatives and superlatives of adverbs are normally formed with more and most, though there are some exceptions.
Adjectives of one syllable: add -er and -est: Strong stronger the strongest Wise wiser the wisest Dry drier the driest Hot hotter the hottest
People grow older and wiser every day.
Some are irregular: Bad worse the worst Good better the best Far further the furthest Far farther the farthest Little less the least Much more the most Many more the most
Sunny weather is better than rainy weather. Stormy weather is definitely the worst.
Adjectives of two or more syllables take more and most except two-syllable adjectives which end in -y: Famous more famous the most famous Beautiful more beautiful the most beautiful Funny funnier the funniest
Elvis Presley was one of the most famous rock musicians in the world. Jaan is a famous musician in his village.
The following two-syllable adjectives can take either -er/-est or more/most: Common, cruel, gentle, handsome, likely, mature, narrow, pleasant, polite, shallow, simple, stupid. Stupid stupider the stupidest Stupid more stupid the most stupid
Most adverbs take more and most: Easily more easily most easily Loudly more loudly most loudly
I wake up easily, because my alarm clock rings loudly. My brother wakes up more easily, because his alarm clock rings more loudly.
Some are irregular: Well better best Badly worse worst
Adverbs with the same form as adjectives form comparatives and superlatives in the same way as adjectives: Fast faster fastest Early earlier earliest Hard harder hardest
The horse is running fast. The sheep is running faster than the horse. The dog is running fastest.