Para practicar...

Webs para practicar:

http://www.curso-ingles.com/practicar/ejercicios/comparatives-and-superlatives
http://www.ejerciciosinglesonline.com/new-exercises/ex-comparative-superlative/
http://www.ejerciciosinglesonline.com/new-exercises/ex2-comparative-superlative/
http://www.ejerciciosinglesonline.com/new-exercises/ex1-comparative-superlative/
http://www.ejerciciosinglesonline.com/new-exercises/ex3-comparativo-superlativo/
http://www.ejerciciosinglesonline.com/new-exercises/ex4-comparativos-y-superlativos/
http://www.ejerciciosinglesonline.com/new-exercises/
http://www.ejerciciosinglesonline.com/new-exercises/ex1-comparative-superlative/
http://www.learnenglishfeelgood.com/sp/adjetivos-comparativos1.html
http://www.agendaweb.org/exercises/grammar/comparison/comparison-write-2
http://first-english.org/english_learning/english_year_2/comparison_adjectives/22_coparison_adjectives_irregular.htm
http://mrsc.free.fr/44-4-comparatif.htm
http://www.groovetoenglish.com/comparingfriends.htm
http://www.eslkidsworld.com/Interactive%20games/comparatives%20and%20superlatives%20animals%20football%20quiz.html