Adjectives change in form to show comparison,they are called Degree Of Comparison.

Type of Degree Of Comparison

POSITIVE DEGREE
COMPARATIVE DEGREE
SUPERLATIVE DEGREE


In the first sentence it explains only that, John is a tall boy. Here John is not compared with any others. In such cases, when adjective is used with out any comparison to other nouns we call it as POSITIVE DEGREE.


In the second sentence the adjective is used for comparison between two people, such cases when adjective is used for comaprison of two person,thing we call it as COMPARATIVE DEGREE.

In Comparative Degree use 'than' after the adjectives.
taller than
greater than

In third sentence the comparison is between more than two people,such case we say it as SUPERLATIVE DEGREE.

NOTE :

If ' er ' is added to Adjectives(positive) then Comaparative degree is formed and when ' est ' is added to Adjectives(positive) then Superlative degree is formed.

POSITIVE	COMPARATIVE	SUPERLATIVE
clever long high great sweet young tall	cleverer longer higher greater sweeter younger taller	cleverest longest highest greatest sweetest youngest tallest

If positive ends in 'e' add 'r' and 'st' to form comparative and superlative.

POSITIVE	COMPARATIVE	SUPERLATIVE
large wise white brave pure fine able	larger wiser whiter braver purer finer abler	largest wisest whitest bravest purest finest ablest

We can add more and most before adjective to form comparative and superlative.

POSITIVE	COMPARATIVE	SUPERLATIVE
beautiful useful famous difficult important honest powerful	more beautiful more useful more famous more difficult more important more honest more powerful	most beautiful most useful most famous most difficult most important most honest most powerful

If positive ends in 'y' add 'er' and 'est' to form comparative and superlative after changing 'y' to 'i'.

POSITIVE	COMPARATIVE	SUPERLATIVE
lovely wealthy holy easy happy heavy healthy	lovelier wealthier holier easier happier heavier healthier	loveliest wealthiest holiest easiest happiest heaviest healthiest

For some adjectives that ends mainly with 'd, g, t, m, n' to form comparative and superlative, add the last letter twice and then add 'er' and 'est'.

POSITIVE	COMPARATIVE	SUPERLATIVE
red sad big hot fat dim thin	redder sadder bigger hotter fatter dimmer thinner	reddest saddest biggest hottest fattest dimmest thinnest

For some adjectives(positive) form comparative and superlative that are entirely different from the positive form '.

POSITIVE	COMPARATIVE	SUPERLATIVE
late good bad much near little many	later, latter better worse more nearer less, lesser more	latest, last best worst most nearest, next least most

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