TO BE
ONLINE EXERCICES
http://www.kico4u.de/english/uebungen/5klasse/becon.htm
http://www.juntadeandalucia.es/averroes/ceip_san_tesifon/recursos/ingles/act_interactivas/cuestionarios/tobe0.htm
http://www.englishmaven.org/HP6/To_Be_Exercise4.htm
http://www.eflnet.com/grammar/tobepresent.php
http://www.agendaweb.org/verbs/to-be-exercises.html