Korean · Pronunciation Guide
eet-tta. Both consonants do something surprising: the ㅆ is cut off as an unreleased t, and that closure forces the following ㄷ into a tensed ㄸ.
itda
Two syllables of roughly equal length, though the first is clipped short by that unreleased stop. The change worth naming is post-obstruent tensing: any plain consonant following a stop batchim automatically becomes its tensed twin, which is why this is itda and never 'it-da'.
Listen: 있다
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저는 강아지가 있어요.
Jeoneun gangajiga isseoyo.
I have a dog.
Listen: 저는 강아지가 있어요.
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저는 강아지가 있어요 shows the opposite behaviour. Once a vowel follows, the ㅆ comes back to life and resyllabifies into a full hissing double s, giving i-sseo-yo. The same word therefore alternates between a silent stopped t and a strong ss depending purely on what comes next.
Learners say 'it-dah' with a released t and a soft English d, which sounds mushy and slow. There should be no audible release on the t whatsoever -- the mouth simply closes -- and the consonant after it should be tight and unaspirated. Put a hand on your throat: the tensed ㄸ comes with a squeeze you can physically feel, and that squeeze is the entire difference between ㄷ, ㄸ and ㅌ.