CAN   ---------------CAN'T 

1http://www.englisch-hilfen.de/en/exercises/modals/can2.htm

2  http://www.englishexercises.org/makeagame/viewgame.asp?id=1518

3 http://www.english-grammar-lessons.com/can/exercise3.swf

4  http://mbonillo.xavierre.com/exercises/eso1/1eso2007/can3.htm

5 http://www.ecenglish.com/learnenglish/lessons/can-or-cant

6 http://www.english-grammar-lessons.com/can/exercise3.swf

7 http://first-english.org/english_learning/english_beginners/can_can_t_exercises/01_can_english_grammar_exercises.htm

Si deseas conocer mas acerca del verbo modal can puedes acceder a los siguientes links

http://elblogdelingles.blogspot.mx/2006/05/lesson-16-can.HTML

http://elblogdelingles.blogspot.mx/2006/05/lesson-16-can.HTML