L'article partitif et le pronom EN

https://leblogdeflecantely.blogspot.com/2018/01/les-partitifs-en-francais.html
https://lebaobabbleu.files.wordpress.com/2015/11/exercices-pronom-en.pdf
http://instruction2.mtsac.edu/french/french2/questionsreponses/en.htm
http://uregina.ca/~laninstit/HotPot/French/Elementaire/exercises/L/l003.htm
http://www.laits.utexas.edu/fi/quiz/pronoun-en
http://uregina.ca/~laninstit/HotPot/French/Elementaire/exercises/P/p004.htm
http://uregina.ca/~laninstit/HotPot/French/Elementaire/exercises/P/p005.htm
http://quizlet.com/8319966/le-pronom-en-flash-cards/
http://net2.hkbu.edu.hk/~reyjeanl/exercises/pron-1.htm
http://w3.restena.lu/amifra/exos/gram/prind3.htm