There are three forms of comparison:

- positive
- comparative
- superlative

 

A - Comparison with -er/-est

clean - cleaner - (the) cleanest

 

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

 

1) Adjectives with one syllable

2) Adjectives with two syllables and the following endings:

 

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

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

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

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

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

B - Comparison with more - most

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

 

C - Irregular adjectives

D - Special adjectives

 

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

E - Difference in meaning with adjectives: