Present simple VS Present Continuous

Teoría en INglés (se entiemde bien)
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro


Ïndice general con todas las actividades por curso  (trae solución)
http://www.burlingtonbooks.com/Spain/Page.aspx?PageID=409

Present simple
http://www.burlingtonbooks.com/Spain/GetResource.aspx?ResourceID=2615
http://www.burlingtonbooks.com/Spain/GetResource.aspx?ResourceID=2624

present continuous
http://www.burlingtonbooks.com/Spain/GetResource.aspx?ResourceID=2618

Contraste: PResent simple vs Present Continuous
http://www.englishpage.com/verbpage/verbs1.htm   (click en CHECK para comprobar la solución)
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
http://www.burlingtonbooks.com/Spain/GetResource.aspx?ResourceID=2619
http://www.burlingtonbooks.com/Spain/GetResource.aspx?ResourceID=2647