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Comparative Adjectives.

One-syllable adjectives.

Form the comparative and superlative forms of a one-syllable adjective by adding -er for the comparative form and -est for the superlative.

One-Syllable Adjective Comparative Form Superlative Form
tall taller tallest
old older oldest
long longer longest

If the one-syllable adjective ends with an e, just add -er for the comparative form and -st for the superlative form.

One-Syllable Adjective with Final -e Comparative Form Superlative Form
large larger largest
wise wiser wisest

If the one-syllable adjective ends with a single consonant with a vowel before it, double the consonant and add -er for the comparative form; and double the consonant and add ?-est for the superlative form.

One-Syllable Adjective Ending with a Single Consonant with a Single Vowel before It Comparative Form Superlative Form
big bigger biggest
thin thinner thinnest
fat fatter fattest

Two-syllable adjectives.

With most two-syllable adjectives, you form the comparative with more and the superlative with most.

Two-Syllable Adjective Comparative Form Superlative Form
peaceful more peaceful most peaceful
pleasant more pleasant most pleasant
careful more careful most careful
thoughtful more thoughtful most thoughtful

If the two-syllable adjectives ends with -y, change the y to i and add -er for the comparative form. For the superlative form change the y to i and add -est.

Two-Syllable Adjective Ending with -y Comparative Form Superlative Form
happy happier happiest
angry angrier angriest
busy busier busiest

Two-syllable adjectives ending in -er, -le, or -ow take -er and -est to form the comparative and superlative forms.

Two-Syllable Adjective Ending with -er, -le, or -ow Comparative Form Superlative Form
narrow narrower narrowest
gentle gentler gentlest

Adjectives with three or more syllables.

For adjectives with three syllables or more, you form the comparative with more and the superlative with most.

Adjective with Three or More Syllables Comparative Form Superlative Form
generous more generous most generous
important more important most important
intelligent more intelligent most intelligent

Exceptions.

Irregular adjectives.

Irregular Adjective Comparative Form Superlative Form
good better best
bad worse worst
far farther farthest
little less least
many more most

Two-syllable adjectives that follow two rules. These adjectives can be used with -er and -est and with more and most.

Two-Syllable Adjective Comparative Form Superlative Form
clever cleverer cleverest
clever more clever most clever
gentle gentler gentlest
gentle more gentle most gentle
friendly friendlier friendliest
friendly more friendly most friendly
quiet quieter quietest
quiet more quiet most quiet
simple simpler simplest
simple more simple most simple
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