Can / could / be able to:
http://www.englishclub.com/grammar/verbs-modals_can_quiz.htm
http://www.ecenglish.com/learnenglish/lessons/can-could-be-able
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/modal-verbs-ability.html
Have to / must / should:
http://www.englishexercises.org/makeagame/viewgame.asp?id=3401
May / might / can´t / must:
http://www.autoenglish.org/gr.may3.i.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-10201.php
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