Adjective (Comparison)

There are three degrees of comparison

Positive         Comparative           Superlative

Tall                taller                       tallest

Brave             braver                     bravest

Dark              darker                     darkest

Interested       more interested        most interested

Interesting      more interesting       most interesting

Useful            more useful             most useful

Obscure         more obscure          most obscure

Note:

1. one-syllable adjectives form their comparative and superlative by adding “er” and “est” to the positive form:

tall – taller

tall – tallest

but for adjective ending in e add “r” and “st”

brave – braver

brave - bravest

2. Adjectives of three or more syllables form their comparative and superlative by putting more and most before their positive:

Interested - more interested

Interested - most interested

3. Adjectives of two syllables ending in ful or re usually take more and most:

Useful – more useful

Useful – most useful

Obscure – more obscure

Obscure – most obscure

And besides those rules there are Irregular Comparison, here are some examples of them:

Bad       worse     worst

Far       farther    farthest

Far       further    furthest (additional/extra)

Good    better      best

Old         older         oldest (people and things)

Old         elder         eldest (people only)