PRESENT SIMPLE AND PRESENT CONTINUOS
- http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
- http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex05
- http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test1
- http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3
- http://www.englishexercises.org/makeagame/viewgame.asp?id=1438
- http://www.perfect-english-grammar.com/present-simple-present-continuous-2.html
- http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-13689.php
- http://www.e-grammar.org/present-simple-continuous/test1-exercise1/
- http://www.eclecticenglish.com/grammar/PresentContinuous1I.html
- http://www.englishpage.com/verbpage/verbs1.htm
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