Problems with the past simple pronunciation when we are talking about regular verbs? Please, revise this. If still in trouble, click here. You can also have a look at this presentation by Ana Fuster (EOI Cartagena), about the pronunciation of the -ed ending.
Besides, a couple of videos will always come in handy in this case. The second one includes quite a lot of drills, so do not hesitate to watch it:
IRREGULAR VERBS
Watch this video to revise the pronunciation of irregular verbs:
