Smrt 120 can, could, do you mind?

http://www.englishexercises.org/makeagame/viewgame.asp?id=8616

Work in pairs: http://es.slideshare.net/jbsaenz/requests-can-could-will-would-would-you-mind

http://www.englishexercises.org/makeagame/viewgame.asp?id=7710

MODALS - SMRT 120

http://www.perfect-english-grammar.com/modal-verbs-of-obligation-exercise-1.html

http://www.englishpage.com/modals/interactivemodal1.htm 

EXERCISES WITH MODALS   Smrt 120

http://www.myenglishpages.com/site_php_files/grammar-exercise-modals.php#.VFo_WPmUeqs

http://esl.fis.edu/grammar/multi/modal1.htm

https://advancedenglish1.wordpress.com/2012/02/06/practice-with-modal-auxiliary-verbs-2th-period/