Exercises on modal verbs

Here you have some exercises on modal verbs. In each exercise there is a brief explanation. Have fun!

http://www.englishexercises.org/makeagame/viewgame.asp?id=3738

http://www.englishexercises.org/makeagame/viewgame.asp?id=1793#a

http://www.englishexercises.org/makeagame/viewgame.asp?id=3023

http://www.englishexercises.org/makeagame/viewgame.asp?id=2083

http://www.englishexercises.org/makeagame/viewgame.asp?id=2229

http://www.englishexercises.org/makeagame/viewgame.asp?id=3919

http://www.englishexercises.org/makeagame/viewgame.asp?id=1568

http://www.englishexercises.org/makeagame/viewgame.asp?id=2215

http://www.englishexercises.org/makeagame/viewgame.asp?id=3401

http://web.educastur.princast.es/ies/elpiles/ARCHIVOS/paginas/depar/ingles/mis_ejercicios/4eso.htm#modales

http://www.nonstopenglish.com/lang/es/exercise.asp?exid=917