Review these four videos daily for one week.
Pronunciation of the Final 'ed' of Past Tense Verbs
http://www.manythings.org/b/e/4426
How to Pronounce 'ed' Endings
http://www.manythings.org/b/e/4365
How to Say -ed endings in English
[t], [d], or [Id] ? Pronunciation of Past Tense
Quiz: Simple Past Review
http://a4esl.org/q/f/x/xz39met.htm
Be sure to find other lessons on Many Things.org and Activities for ESL.
Look at this cartoon: Road Runner Grammar. Copy & paste the link.
http://www.youtube.com/watch?v=k3PrjDh89sQ&feature=related
Now take this quiz. It reviews present, past and future tenses.
http://www.softschools.com/quizzes/grammar/verbs/quiz236.html
Both of these songs have many verbs in the past tense.
Yesterday, Once More by the Carpenters
http://www.youtube.com/watch?v=RR1v3MZcHDw
Yesterday, by the Beatles
http://www.youtube.com/watch?v=-G6IxcmgblA&list=UUQGYtNKeLTbUFcYLT1MaTEw&index=1