Modal auxiliaries

can - ability
http://www.learn-english-online.org/Lesson47/Lesson47.htm
Exercise - Poem - can - ability
http://www.learn-english-online.org/Lesson47/poem47.htm
must/can't
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-10201.php
must/mustn't/have to/don't have to
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-7900.php
will/won't have to/won't be able to
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-21102.php

all together
http://www.myenglishpages.com/site_php_files/grammar-exercise-modals.php
http://www.e-grammar.org/modal-verbs-can-may-must/



Learn modalverbs with songs

http://www.youtube.com/watch?v=mBIawQGe-88


Games
http://www.eslgamesplus.com/modal-verbs-can-could-might-must-should-would-catapult/
http://eslkidsworld.com/Interactive%20games/Grammar%20Games/Modal%20Verbs/advice%20using%20should%20and%20shouldnt.html
http://kidseslgames.com/grammar%20games/Modal%20Verbs/modalverbs2.html
http://www.esltower.com/Games/GrammarGames/New_Snakes_%20Ladders/Mixed_Modals_Snakes_Ladders.html
http://www.englishmedialab.com/GrammarGames/basketball/modals%20can%20must%20would/modals%20can%20must%20would.html