http://www.english-grammar-lessons.com/musthaveto/exercise9.swf
http://www.english-grammar-lessons.com/could/exercise3.swf
http://esl.fis.edu/grammar/multi/modal1.htm
http://ingles.iesboliches.org/activities/grammar/tenses/MODAL-VERBS1.htm
http://inglesnanet.com/grammar/modverbs.htm
www.english-grammar-lessons.com/musthaveto/exercise7.swf
http://www.englishgrammarsecrets.com/maymight/exercise1.swf
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-1417.php
http://www.englishgrammarsecrets.com/maymight/exercise3.swf
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-ability1.htm
http://www.englishpage.com/modals/interactivemodal8.htm
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