Korean · Pronunciation Guide
a-i. Two bare vowels with no consonant anywhere -- open ㅏ then tight ㅣ, joined without a break.
ai
Two syllables with no consonants at all, which makes this the purest vowel-transition word in the course. The only thing to time is the join, which stays connected rather than being broken into two separate sounds.
Listen: 아이
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아이가 밖에서 놀아요.
Aiga bakkeseo norayo.
The child is playing outside.
Listen: 아이가 밖에서 놀아요.
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아이가 밖에서 놀아요 attaches the subject particle, and 밖에서 does something instructive: the tensed ㄲ batchim of 밖 resyllabifies forward and stays tensed, giving ba-kke-seo with a hard k in the middle.
The glottal stop is the entire pitfall here. English speakers put one at the start and often another in the middle, producing something like 'ah-ee' with two hard onsets, when Korean wants a single continuous stream. Practise it as one smooth movement of the tongue rather than as two syllables.