Exercise on Simple Present - Present Progressive

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex02

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex03

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex05

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex06

SIMPLE PAST TENSE

http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php#.Ux-r4z95PTo

http://www.grammarbank.com/simple-past-tense-exercises.html