3RD SYSTEMS - SCIENCES

http://www.web-esl.com/Adj_Adv/rewriting.htm
http://es.scribd.com/doc/47848697/Adverb-Time-Manner-Place-and-Frequency

comparativs and surlatives
http://learnenglishkids.britishcouncil.org/en/grammar-games/comparatives-and-superlatives