Korean · Pronunciation Guide
man-na-da. The two ㄴ sounds across the 만+나 seam are held as one long n, so the middle of the word takes an extra beat of nasal.
mannada
Three beats, though the first two are welded together by that long n, giving the word a slightly heavier middle than its syllable count suggests. The length is phonological rather than emphatic -- the consonant is long, the syllable is not loud.
Listen: 만나다
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내일 친구를 만나요.
Naeil chingureul mannayo.
I'm meeting a friend tomorrow.
Listen: 내일 친구를 만나요.
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내일 친구를 만나요 ends on the conjugated 만나요, which keeps the same geminate n. Ahead of it, 친구를 attaches the object particle after a vowel and runs as chin-gu-reul, so the sentence contains a long nasal in the middle and a quick tap in the object phrase -- two very different behaviours in one line.
English speakers pronounce doubled letters as single sounds, so 'ma-na-da' is the usual output and it is audibly too short. Hold the n: make contact and keep it for roughly twice the duration of a single one. Aspirating the final ㄷ is the other slip, since it sits between vowels and should stay soft.