TO BE exercises (Enlaces donde practicar)

http://www.englishmaven.org/HP6/To_Be_Exercise1.htm

http://www.bradleys-english-school.com/online/flashmultiplechoice/mc_amisare.html

http://www.eclecticenglish.com/grammar/PresentSimpleToBe1A.html

http://www.anglomaniacy.pl/grammar-verbs-practise1.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=5679

http://www.myenglishpages.com/site_php_files/grammar-exercise-be-present.php

https://learnenglishkids.britishcouncil.org/en/grammar-games/present-simple-verb-be