Can, Should & Must Exercises

Some exercises to practice:

Can

http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://www.saberingles.com.ar/curso/lesson13/05.html
http://www.englisch-hilfen.de/en/exercises/questions/can2.htm

Should

http://www.englishexercises.org/makeagame/viewgame.asp?id=1734
http://www.eclecticenglish.com/grammar/Should1A.html
http://www.eclecticenglish.com/grammar/Should1B.html

Must

http://www.englishexercises.org/makeagame/viewgame.asp?id=2786
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-72827.php

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