Present Simple vs. Present Continuous
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex04
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex10
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test1
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3
Past Simple vs. Past Continuous
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex05
http://www.englishexercises.org/makeagame/viewgame.asp?id=734
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm
http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html
Present Perfect
http://www.really-learn-english.com/present-perfect-exercises.html
http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-1
http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm
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