Grabate esto claro, si en pasado simple la terminacion es - ed en pasado participio tambien lo sera.
Todos los verbos se dividen en 3 tiempos : Simple Present(SP), Simple Past(SPast), Past Participle(PP).
SP : Sing
SPast : Sang
PP : Sung
SP : play
SPast : Played
PP : Played
SP : lock
SPast : Locked
PP : Locked
SP : like
SPast : Liked
PP : Liked
SP : copy
SPast : Copied
PP : Copied
SP : skydive
SPast : skydived
PP : Skydived
SP : drink
SPast : Drank
PP : Drunk
SP : read (Se pronuncia ''riid'')
SPast : read (Se pronuncia ''red'')
PP : read (Se pronuncia ''red'')
SP : write
SPast : wrote
PP : written
SP : try
SPast : Tried
PP : Tried
SP : enjoy
SPast : enjoyed
PP : enjoyed.