Korean · Pronunciation Guide
gat-tta. The ㅌ batchim neutralizes to an unreleased t and loses all its aspiration, and then it tenses the following ㄷ into ㄸ.
gatda
Two beats around a held closure. Worth noting that batchim neutralization destroys information: ㅌ, ㅅ, ㅆ, ㅈ, ㅊ and ㅎ all collapse to the same unreleased t, so 같다 and 갔다 sound identical in citation form and only diverge once a vowel follows.
Listen: 같다
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좋은 생각인 것 같아요.
Joeun saenggagin geot gatayo.
It seems like a good idea.
Listen: 좋은 생각인 것 같아요.
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좋은 생각인 것 같아요 conjugates to 같아요, where the ㅌ resyllabifies forward and recovers its aspiration, giving ga-ta-yo. In front, 좋은 deletes its ㅎ between vowels to give jo-eun, so one short phrase contains both a recovered consonant and a deleted one.
Learners aspirate the batchim, producing 'gath-da' with a breathy release in the middle, when final position strips that away completely. And once the closure is right, the following consonant still needs to be tensed rather than a plain English d -- the two errors reinforce each other, so fixing only one leaves the word sounding wrong.