http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/have-must-and-should-obligation-and-advice
http://www.clafoti.com/Imagenes/Verb_can_1.htm
http://www.agendaweb.org/verbs/modals-exercises.html
http://www.agendaweb.org/verbs/be_can_do_have-exercises.html
http://www.english-grammar-lessons.com/could/exercise1.swf
http://www.english-grammar-lessons.com/should/exercise5.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=1859
http://www.englishexercises.org/makeagame/viewgame.asp?id=2229
http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-33.php
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CAN vs CAN´T
http://saberingles.com.ar/curso/lesson13/05.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-62121.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://www.englishexercises.org/makeagame/viewgame.asp?id=5204
http://www.englishgrammarsecrets.com/can/menu.php
http://www.englisch-hilfen.de/en/exercises/questions/can2.htm
http://saberingles.com.ar/curso/lesson13/05.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-62121.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=1518
http://www.englishexercises.org/makeagame/viewgame.asp?id=5204
http://www.englishgrammarsecrets.com/can/menu.php
http://www.englisch-hilfen.de/en/exercises/questions/can2.htm
THERE IS ****THERE ARE.. WAS... WERE.. WILL... NO MODALS
http://www.adelescorner.org/grammar/there_is/thereis.html
http://www.english-room.com/index.php?option=com_wrapper&Itemid=34
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-7001.php
http://www.1-language.com/englishcourse/unit17_grammar_exs.htm
http://www.usingenglish.com/quizzes/74.html
http://www.kico4u.de/english/uebungen/5klasse/thisare_ex2.htm
http://www.my-english.edu.pl/index.php?id=66
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-8958.php
http://www.adelescorner.org/grammar/there_is/thereis.html
http://www.english-room.com/index.php?option=com_wrapper&Itemid=34
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-7001.php
http://www.1-language.com/englishcourse/unit17_grammar_exs.htm
http://www.usingenglish.com/quizzes/74.html
http://www.kico4u.de/english/uebungen/5klasse/thisare_ex2.htm
http://www.my-english.edu.pl/index.php?id=66
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-8958.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-55666.php
http://www.grammar-quizzes.com/modal3.html