Asked is pronounced “askt” not “askd”.
Worked is workt, cooked is cookt, walked is walkt(the “l” here is silent) , kissed is kist, liked is likt, stopped is stopt, looked is lookt, dropped is dropt…
Are you wondering why?
When the last sound before -ed is voiceless (which means you won’t feel your vocal cords vibrate), the -ed sound is /t/.
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When the last sound before -ed is
/t/ or /d/ the -ed sound is /id/.
i.e Waited is waitid, wanted is wantid, needed is needid, decided is decidid, hated is hatid, tasted is tastid, ended is endid… (You need to learn how to sound this “id”)
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When the last sound before -ed is voiced (which means you will feel your vocal cords vibrate), the-ed sound is /d/.
e.g Played, showed, closed, opened, enjoyed, loved, tried, rained, learned, cleaned.
I hope you found this useful?