P. Perfect vs P. Simple (fill in gaps text)
P. Perfect vs P. Simple ( tutorial + ex )
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex02
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex05
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex06
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex07
For / Since exercises :
http://www.englishexercises.org/makeagame/viewgame.asp?id=1394
http://www.ibericostierradesalamanca.com/englishweb/forsince.html
http://www.englisch-hilfen.de/en/exercises/confusing_words/since_for.htm
http://langues.u-bordeaux4.fr/ANGLAIS/EXOGRAM/forsinceago1.htm
http://www.english-grammar-lessons.com/presentperfectcontinuous/exercise4.swf
http://www.esltower.com/GRAMMARQUIZ/intermediate/since%20for%20last%20ago.htm
http://www.english-grammar-lessons.com/presentperfectorpastsimple/exercise3.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=2540 (P. Perf. time expressions)
http://www.esl-lounge.com/student/grammar/1g92-elementary-time-expressions-gap-fill.php
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