1. Superlatives
1.1. Short adjectives
1.1.1. Form : the + adj-est
1.1.2. Double the final consonant if it comes right after a vowel. Eg: shortest
1.1.3. For adj ending in –e, just add –st. Eg: cutest
1.1.4. For adj ending in –y, change –y to –i then add –st. Eg: tidy => tidiest
1.2. Irregular
1.2.1. bad => worst
1.2.2. good => best
1.2.3. far => farthest/furthest
2. Long adjectives
2.1. Form : the + most/least + adj
2.2. Eg: the most beautiful, the least polluted
2.3. Some adj have two superlatives forms. Eg: narrow => the narrowest/most narrow
3. Comparatives
3.1. Short adjectives
3.1.1. Form: Adj-er + than
3.1.2. Double the final consonant if it comes right after a vowel. Eg: lower, shorter
3.1.3. For adj ending in –e, just add –r. Eg: cuter
3.1.4. • For adj ending in –y, change –y to –i and add –er. Eg: healthier, wealthier
3.2. Long adjectives
3.2.1. Form : more / less + adj + than
3.2.2. Eg: more intelligent, more attractive
3.2.3. Some adj have two comparatives forms. Eg: narrow => narrower, more narrow
3.3. Irregular
3.3.1. bad => worse
3.3.2. good => better
3.3.3. far => farther/further