Video explaning -ed pronunciation:
Here you have another video with a clear explanation too:
And another one:
Fancy some practice?
Exercise 3 (with sound): http://eolf.univ-fcomte.fr/uploads/ressources/pronunciation/01_-ed_endings/01_ed.htm
Past simple pronunciation quiz: http://www.proprofs.com/quiz-school/story.php?title=past-simple-pronunciation-regular-verbs
Irregular verbs pronuciation with sound: http://english-irregular-verbs.blogspot.com.es/
Now, the fun part and you know what that means: SONGS!!!!!
Song 1: The Boy Does Nothing
Notice the way she says: 'Does he brush up?' Never brushed up' /brʌʃtʌp/
Song 2: Because you loved me
Please, do notice the pronunciation of irregular verbs such as SAID /sed/ or BROUGHT /brɔ:t/and the pronunciation of regular verb such as BLESSED /blest/ or LOVED /lʌvd/.Besides, there are other aspects of English pronunciation that you should pay attention to, for instance, when she says "I'M EVERYTHING I AM BECAUSE OF YOU" /ɑɪmevrɪθɪŋ/.
Song 3: You are beautiful
I suppose you paid attention to the pronunciation of the past, didn't you?
I saw /sɔ:/ your face in a crowded /kraʊdɪd/ place.
She smiled at /smaɪldət/ me on the subway.
She caught /kɔ:t/ my eye as I walked /wɔ:ktɒn/ on by.
Song 4: This Old Guitar
Lots of examples of both regular and irregular verbs pronunciation.