PAST SIMPLE

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_statements2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences3.htm

http://www.englisch-hilfen.de/en/exercises/questions/simple_past2.htm

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03

http://www.englishexercises.org/makeagame/viewgame.asp?id=3303

PAST CONTINUOUS

http://s.mound.free.fr/skyblues67/WasWereVing/conjwasworking.htm

http://www.focus.olsztyn.pl/en-exercises-past-continuous-test-1.html#.WIiMp4WcG1s

http://www.englishexercises.org/makeagame/viewgame.asp?id=5778

http://www.englisch-hilfen.de/en/exercises/tenses/past_progressive_statements2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/past_progressive_negation_sentences2.htm

http://www.englisch-hilfen.de/en/exercises/questions/past_progressive2.htm

PAST SIMPLE AND CONTINUOUS

http://www.englishpage.com/verbpage/verbs3.htm

http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises

http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex02

http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex03

http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex04

http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07

PRESENT PERFECT

http://www.englisch-hilfen.de/en/exercises/confusing_words/since_for.htm

http://www.englisch-hilfen.de/en/exercises/confusing_words/since_for2.htm

http://www.adelescorner.org/grammar/for_since/for-since2.html

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

http://www.englisch-hilfen.de/en//tenses/present_perfect_negation.htm

http://www.englisch-hilfen.de/en/exercises/questions/present_perfect.htm

http://www.english-grammar-lessons.com/presentperfect/exercise2.swf

http://www.adelescorner.org/grammar/pres_perfect/pres_perfect_1.html

http://www.english-4u.de/pres_perf_ex1.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=2998

http://www.ecenglish.com/learnenglish/lessons/present-perfect-life-experiences

http://suz.digitaleschulebayern.de/english/grammar/presperfs4.htm

http://www.learnenglish.de/Games/Tenses/PresPerSim.html

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_negation.htm

http://www.englisch-hilfen.de/en/exercises/questions/present_perfect.htm