https://www.esl-library.com/pdf/lessons/10.comparatives-superlatives.pdf
http://ies1libertas.edu.gva.es/departamentos/ingles/PDFs/tercero/ecomsu3e1.pdf
http://www.azargrammar.com/assets/fwg/FWGChapter13.pdf
http://www.anna-grammar.com/worksheets/AGW_comparative_elem.pdf
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