Can/Can't (Exercises and Videos)

http://www.1-language.com/englishcourse/unit18_grammar_exs.htm

http://www.real-english.com/reo/15/unit15.asp

http://www.youtube.com/watch?feature=player_embedded&v=HjvUDWymBcg#!

http://www.youtube.com/watch?feature=player_embedded&v=3XsKh3JCuPI#!