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I hope this one can help you. You do not need to memorize all the words. There are rules for the comparative adjectives.
The below paragraphs are quoted directly from:
http://www.hiway.co.uk/~ei/english/grammar7.html
SECTION SEVEN: COMPARISON OF ADJECTIVES:
7.1 Usage: To compare the description of two or more people/animals/things/places.
e.g. John is young but Mary is younger and Michael is the youngest.
7.2 Structure: Regular Adjectives:
e.g. Adjective Comparative Superlative
young younger youngest
small smaller smallest
There are five rules for the construction of the Comparative and Superlative forms of regular adjectives.
A: Short adjectives of one syllable add -er and -est to the adjective:
e.g. old older oldest
Here are more examples of adjectives of one syllable: young, small, tall, cheap, few.
B: When an adjective ends in -y, change this letter to -i and add -er and -est:
e.g. easy easier easiest
Here are more examples of adjectives that end in -y: heavy, early, busy, healthy, noisy, lucky, silly, happy.
C: When an adjective ends in -e, remove the -e and then add -er and -est:
e.g. large larger largest
Here are some more examples of adjectives that end in -e: brave, wise, safe, pale, simple, late.
D: When an adjective ends with a vowel plus a consonant, double the consonant and then add -er and -est:
e.g. big bigger biggest
Here are some more examples of adjectives of this type: thin, hot, fat, fit.
E: Adjectives of three or more syllables and some adjectives of two syllables do not change but more and most are put in front of these adjectives:
e.g. beautiful more beautiful most beautiful
Here are some more examples of adjectives of this type: delicious, efficient, humorous, expensive, careful, modern, famous, correct, honest.
7.3 Structure: Irregular Adjectives:
There are three adjectives which do not follow any rule: these must be memorised:
Adjective Comparative Superlative
good better best
bad worse worst
far farther/further farthest/furthest