http://www.tapis.com.au/studentbook1/unit5/u05_grammaire_a01.html
http://www.tapis.com.au/studentbook1/unit3/u03_grammaire_a02.html
http://www.tapis.com.au/studentbook1/unit3/u03_grammaire_a03.html
http://babelnet.sbg.ac.at/canalreve/jeux/tempsludiques/er/present/index.htm
http://fog.ccsf.cc.ca.us/~creitan/qchap1er.htm
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