Korean · Pronunciation Guide
ga-chi. Written with a ㅌ, but a ㅌ batchim in front of ㅣ palatalizes into ch -- so this is never 'gat-i'.
gachi
Two syllables, evenly timed. This word is the textbook case of ㄷ/ㅌ palatalization, a rule that fires whenever one of those batchims is followed by the vowel ㅣ, and it explains why the spelling and the romanization look so unrelated.
Listen: 같이
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같이 갈까요?
Gachi galkkayo?
Shall we go together?
Listen: 같이 갈까요?
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
같이 갈까요? follows it with the -ㄹ까요 suggestion ending, where the ㄹ tenses the ㄱ into ㄲ, giving gal-kka-yo. A palatalization and a tensing therefore land inside one four-syllable question.
Reading the blocks literally gives 'gat-i', which is the single most common mispronunciation of this word among learners -- the ㅌ does not stay a t. Note also that the aspiration survives the change, so it becomes ch rather than j, and the second syllable should carry a real puff of air.