Pronouncing -ed endings in the past simple and past participle of regular verbs usually gives the students of English as a foreign language a hard time.
However, it´s not that difficult. We must let common sense help us here.
The first thing to take into account is that there are only 3 ways to pronounce this ending:
-/t/ ; -/d/ ; -/ɪd/
/ed/ is not an option! :)
The ending -ed is pronounced /t/ in regular verbs whose last sound in the infinitive is unvoiced (except for
/t/):
/f/, /k/, /p/, /s/, /θ/, /tʃ/, /ʃ/. E.g.:
-like ⇨ liked: /laɪkt/
-stop ⇨ stopped: /stɒpt/
-laugh ⇨ laughed: /lɑːft/ *Note that it´s the sound and not the spelling what counts.
For all other final sounds (except for
/d/) in the infinitive of regular verbs, the ending -ed is pronounced /d/. E.g.:
-listen ⇨ listened: /ˈlɪsnd/
-discover ⇨ discovered: /dɪˈskʌvəd/
-allow ⇨ allowed: /əˈlaʊd/
In fact, it´s extremely difficult, if not impossible, to pronounce the sound /d/ after an unvoiced sound. If you try to pronounce
"liked", for example, with a final /d/ sound, you´ll realize you cannot do it. It´s a sound /t/ what comes out, isn´t it?
Anyway, the difference in the pronunciation between the /t/ and the /d/ endings is insignificant. Therefore,
if you can get the /ɪd/ sound right, you can count yourself lucky. That´s good enough!
So, the key question is,
when do we pronounce /ɪd/?
Well, it´s quite straightforward and this is when common sense plays its role: when the last sound of the verb in the infinitive is /t/ or /d/, adding a /t/ or a /d/ sound wouldn´t make any difference, that´s why we need to add the syllable /ɪd/ to really distinguish the infinitive from the past simple and past participle. E.g.:
-want ⇨ wanted: /ˈwɒntɪd/
-end ⇨ ended: /ˈendɪd/
-hate ⇨ hated: /ˈheɪtɪd/ *Remember: It´s the sound and not the spelling what matters!
As you can see, these one syllable words turn disyllabic.
-permit ⇨ permitted: /pəˈmɪtɪd/
-recommend ⇨ recommended: /ˌrekəˈmendɪd/
Also, these two and three-syllable words add one more syllable when pronouncing the -ed ending. Indeed, when it comes to regular verbs with a /t/ or a /d/ as a final sound in the infinitive,
adding one syllable to pronounce the past simple is the key to getting it right.
Now then, after this explanation, perhaps you´d like to test yourself by doing the following exercises:
Pronouncing -ed endings