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http://www.oup.com/elt/global/products/englishfile/elementary/a_grammar/file04/grammar04_01a/
http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://www.english-grammar-lessons.com/can/exercise3.swf
http://www.edu365.cat/primaria/muds/angles/can/avalua/index.htm
http://www.englishgrammarsecrets.com/can/exercise1.swf

quart div 1/04/2011

http://readtheory.org/beginning/My_Family.htm
http://www.members.iinet.net.au/~adelegc/grammar/pres_cont/pres_cont_1.html
http://www.learn-english-online.org/Lesson7/TestIt/PresCont1.htm