Exercises
Can / Can´t
http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://teacher.schule.at/tom-schoftner/drw_files/modal_verbs_can_cannot_1.htm
http://www.english-grammar-lessons.com/can/exercise1.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=5488
http://www.english-grammar-lessons.com/can/exercise3.swf
http://www.saberingles.com.ar/curso/lesson13/07.html
Questions
http://www.englisch-hilfen.de/en/exercises/questions/question_words.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1898
http://www.englishexercises.org/makeagame/viewgame.asp?id=1718
http://www.englishexercises.org/makeagame/viewgame.asp?id=2763
Present simple
http://www.really-learn-english.com/simple-present-exercises.html#01
http://www.really-learn-english.com/simple-present-exercises.html#03
http://www.really-learn-english.com/simple-present-exercises.html#04
Can / Can´t
http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://teacher.schule.at/tom-schoftner/drw_files/modal_verbs_can_cannot_1.htm
http://www.english-grammar-lessons.com/can/exercise1.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=5488
http://www.english-grammar-lessons.com/can/exercise3.swf
http://www.saberingles.com.ar/curso/lesson13/07.html
Questions
http://www.englisch-hilfen.de/en/exercises/questions/question_words.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1898
http://www.englishexercises.org/makeagame/viewgame.asp?id=1718
http://www.englishexercises.org/makeagame/viewgame.asp?id=2763
Present simple
http://www.really-learn-english.com/simple-present-exercises.html#01
http://www.really-learn-english.com/simple-present-exercises.html#03
http://www.really-learn-english.com/simple-present-exercises.html#04