When the verb ends in a voiceless sound (p, t, k, s, ch, sh)
"ed" says /t/. For example,
When the verb ends in voiced sounds, in other words a vowel or a voiced consonant
(b, g, v, z, r, w, j, m, n, ng, l)
"ed" says /d. For example,
When the verb ends in t or d,
"-ed" adds a syllable, /ɪd. For example,
Get practice recordings for common past tense words here.