exercices 9°
http://www.englishgrammarsecrets.com/usedto/exercise1.html
http://www.englishgrammarsecrets.com/usedto/exercise2.html
http://www.englishgrammarsecrets.com/usedto/exercise3.html
http://www.englishgrammarsecrets.com/usedto/exercise4.html
http://oud.digischool.nl/en/grammatica/pastsimpperf-vraag1.htm
http://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises
http://www.esl-lounge.com/student/grammar/2g43-so-rich-such-wealth.php
http://www.usingenglish.com/quizzes/236.html
http://www.englishgrammarsecrets.com/pastsimple/exercise4.swf
http://www.usingenglish.com/quizzes/311.html