- The pronunciation of the "-ed" suffix when adding it to regular verbs to indicate past tense depends on the final sound of the verb's infinitive form. - "-ed" is pronounced /t/ if the infinitive ends in a voiceless sound like "p", "t", "k", except for verbs ending in "t". - "-ed" is pronounced /d/ if the infinitive ends in a voiced sound like vowels or consonants "b", "d", "g". - "-ed" is pronounced /id/ if the infinitive ends in "t" or "d".