An adjective can be written in three different types to denote three degrees of comparison namely Positive, Comparative and Superlative. The comparison may be of a quality or a quantity, an adjective or an adverb.
Sam is as tall as Pam. - POSITIVE DEGREE
Raj is taller than Joy. - COMPARATIVE DEGREE
Toby is the tallest boy in the class. - SUPERLATIVE DEGREE
From the above examples it is evident that when the degree of comparison changes from one to another, words (denoting the quality) as well as the structure of the sentence changes.
Positive Degree - as adjective as
Comparative Degree - adjective than
Superlative Degree - the adjective
Let us now see how words denoting the comparison are changed.
POINTS TO NOTE :
If the positive ends in two consonants or in a single consonant proceeded by two vowels, ER and EST are added.
Adjectives ending in ed, ing, re, ful, ous and those with the stress on the first syllable usually take more and the most.
charming …..more charming than …..the most charming
famous …..more famous than …..the most famous
hopeful …..more hopeful than …..the most hopeful
learned …..more learned than …..the most learned
obscure …..more obscure than …..the most obscure
Irregular Comparisons : The following Adjectives are compared irregularly, that is, their Comparative and Superlative are not formed from the Positive.
Positive …..Comparative …..Superlative
Bad, evil, ill …..worse …..worst
Far (distance) …..farther …..farthest
Fore …..former….. foremost, first
Good, well …..better …..best
Hind …..hinder …..hindmost
Late …..later, latter …..latest, last
Little …..less …..least
Much (quantity) …..more …..most
Many (number) …..more …..most
Old …..older, elder …..oldest, eldest