test your tenses:
http://www.englishpage.com/verbpage/verbs30finaltest.htm
'signal words' to understand what to use and when:
http://www.ego4u.com/en/cram-up/grammar/tenses
exercises for practice and rules explained:
http://www.englishpage.com/verbpage/verbtenseintro.html
... or maybe a placement test first?
http://www.englishjet.com/english_courses_files/tests.htm
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