A - Comparison with -er/-est

clean - cleaner - (the) cleanest

We use -er/-est with the following adjectives:

1) Adjectives with one syllable

positive	comparative	superlative
clean	cleaner	cleanest
new	newer	newest
cheap	cheaper	cheapest

2) Adjectives with two syllables and the following endings:

2 - 1) Adjectives with two syllables, ending in -y

positive	comparative	superlative
dirty	dirtier	dirtiest
easy	easier	easiest
happy	happier	happiest
pretty	prettier	prettiest

2 - 2) Adjectives with two syllables, ending in -er

positive	comparative	superlative
clever	cleverer	cleverest

2 - 3) Adjectives with two syllables, ending in -le

positive	comparative	superlative
simple	simpler	simplest

2 - 4) Adjectives with two syllables, ending in -ow

positive	comparative	superlative
narrow	narrower	narrowest

3) Spelling of the adjectives using the endings -er/-est

positive	comparative	superlative	comment
large	larger	largest	leave out the silent -e
big	bigger	biggest	Double the consonant after short vowel
sad	sadder	saddest
dirty	dirtier	dirtiest	Change -y to -i (consonant before -y)
shy	shyer	shyest	Here -y is not changed to -i. (although consonant before -y)

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B - Comparison with more - most

positive	comparative	superlative
difficult	more difficult	(the) most difficult

all adjectives with more than one syllable (except some adjectives with two syllables - see
2 - 1 to 2 - 4)

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C - Irregular adjectives

positive	comparative	superlative	comment
good	better	best
bad	worse	worst
much	more	most	uncountable nouns
many	more	most	countable nouns
little	less	least
little	smaller	smallest

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D - Special adjectives

Some adjectives have two possible forms of comparison (-er/est and more/most).

positive	comparative	superlative
clever	cleverer / more clever	cleverest / most clever
common	commoner / more common	commonest / most common
likely	likelier / more likely	likeliest / most likely
pleasant	pleasanter / more pleasant	pleasantest / most pleasant
polite	politer / more polite	politest / most polite
quiet	quieter / more quiet	quietest / most quiet
simple	simpler / more simple	simplest / most simple
stupid	stupider / more stupid	stupidest / most stupid
subtle	subtler / more subtle	subtlest / most subtle
sure	surer / more sure	surest / most sure

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E - Difference in meaning with adjectives:

positive	comparative	superlative	comment
far	farther	farthest	distance
	further	furthest	distance or time
late	later	latest
	latter	x
	x	last
old	older	oldest	people and things
	elder	eldest	people (family)
near	nearer	nearest	distance
	x	next	order