Pronouncing -ED endings

There are rules to pronounce
the Past and Past Participles of Regular verbs.
Pronounce "id" after sounds T/D (starTed , deciDed)
Pronounce "t" after sounds: P/CH/K/F/Z/S/SH (lauGHed, switCHed, ...)
Pronounce "d" after: Vowels and B/G/V/M/N/R/L/ ...
(called, satisfied, planned, ...)
Listen and get good practice on this website.
Have a look at the rules on:
 English Club,
the BBC website (voiced/voicelss consonants)
and on click'n'learn
(go to 4ºESO - Intermediate - The -ED SUFFIX and do the activities).
More practice: 1, 2, 3, 4, 5, 6, 7, 8
Watch the video: