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:
ACTIVITIES:
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/compare-exercises (YOU CAN REFRESH THE PAGE AS MANY TIMES AS YOU WANT, AND CHOOSE LEVEL)
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjectives_comparison_sentences.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjectives_comparison_sentences2.htm
http://www.englisch-hilfen.de/en/exercises/adjectives1/index.php
http://www.englisch-hilfen.de/en/exercises/adjectives2/index.php
http://www.englisch-hilfen.de/en/exercises/adjectives3/index.php