Korean · Pronunciation Guide
sseu-da. The opening ㅆ is tensed -- a hard, hissing s made with a tight throat -- and the vowel is the lip-flat ㅡ, which makes the first syllable the hardest thing in the word.
sseuda
Two beats that feel unequal, because a tensed onset takes time to build. That extra setup is a property of the consonant rather than an accent, and it makes the first syllable genuinely a fraction longer than the second.
Listen: 쓰다
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편지를 쓰고 있어요.
Pyeonjireul sseugo isseoyo.
I'm writing a letter.
Listen: 편지를 쓰고 있어요.
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편지를 쓰고 있어요 keeps the tensed ㅆ in 쓰고 and then gives 있어요 its own double s from the ㅆ batchim resyllabifying forward. Two tensed sibilants in one short sentence, one at the start of a word and one created by a boundary.
Learners produce a plain 'seu-da' and the tension disappears, which matters because a soft-s version is simply a different word. Squeeze the throat and push more air through. The vowel compounds it: 'ssoo-da' with rounded lips is the near-universal substitute, and the lips need to stay spread all the way through that first syllable.