comparisons: more/ er/ as-as

EX: 1 http://pagesperso-orange.fr/raud.dugal/beginners/comparison/exercise%202.htm


EX: 2 http://www.eflnet.com/grammar/compadj.php



EX: 3 http://www.english-zone.com/grammar/compare1.html


EX: 4 http://saberingles.com.ar/curso/lesson12/06.html