The -ed ending is pronounced in three different ways depending on the sound before it. Understanding these rules will help you speak past tense verbs more naturally.
Rule 1: The /t/ Sound
Use /t/ when the base verb ends in a voiceless consonant sound (p, k, f, s, ch, th).
Rule 2: The /d/ Sound
Use /d/ when the base verb ends in a voiced consonant or vowel sound.
Rule 3: The /ɪd/ Sound
Use /ɪd/ when the base verb ends in /t/ or /d/ sounds. This creates an extra syllable.