When DO I have to pronounce (t / d / id) in Past of Regular verbs?
Here's the rule:
1. If the verb ends in a 't' or a 'd' sound, the pronunciation is /id/:
This is because it is impossible to pronounce a 't' or a 'd' directly after another 't' or 'd'. So we make an extra syllable, and pronounce these words 'want-id' and 'need-id'.
2. If the verb ends in a voiced consonant or a vowel, you add a 'd' sound.
Note that the 'ed' here is NOT an extra syllable. For example, with the verb 'lived', we don't day 'liv-ed' - we say /livd/, as one syllable. You go straight from the 'v' sound to the 'd' sound in one smooth movement.
2. If the verb ends in an unvoiced consonant, you add a 't' sound.
Once again, the 'ed' is not a separate syllable - all of these words are pronounced as a single syllable.
I hope that helps.