Hi, There. These are the link to learn and practice the correct use of simple past.
http://www.youtube.com/watch?v=3vNEDDaNIOY
and
http://www.englishmaven.org/Pages/Pronouncing%20ED%20Endings.htm
and
http://www.englishmaven.org/HP6/Pronouncing%20ED%20Endings%20Exercise%201.htm
http://www.englishmaven.org/HP6/Pronouncing%20ED%20Endings%20Exercise%202.htm
http://www.englishmaven.org/HP6/Pronouncing%20ED%20Endings%20Exercise%20Final%20Exam.htm
