I can

You can read these books and have fun.

Try some games

Test yourself about Modals

Modal verbs, by fadime16
Find this and other modals exercises in English Exercises .org

Modals Multiple choice test, by fadime16
Find this and other modals exercises in English Exercises .org

http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/modal_quiz.htm

http://funeasyenglish.com/american-english-grammar-modal-verb.htm#Take_the_test

Probability and deduction

15 sentences 3 situations Modal verbs of probability and deduction , by Irina
Find this and other modals exercises in English Exercises .org

Practice Can

Can for beginners, by Irina
Find this and other modals exercises in English Exercises .org

Must or Mustn't

Modal verbs- Must and mustn´t, by Magdalena Sztuba
Find this and other modals exercises in English Exercises .org