Linguistics Stack Exchange is a question and answer site for professional linguists and others with an interest in linguistic research and theory. It only takes a minute to sign up.
Sign up to join this community
A: Between vowels, /h/ may either be voiced [ɦ] or become inaudible or disappear often.
B: Intervocalically, it is realized as voiced [ɦ], and after voiced consonants it is either [ɦ] or silent.
Some speakers articulate 기회, 생활, 사랑해요, 후회 as 기외, 생왈, 사랑애요, 후외.
What phonological rules are there behind all of these articulation?
It's a very common phonological process - assimilation, whereby one phoneme takes on properties of nearby phonemes.
In this case, the voiceless glottal fricative [h] takes on the property "voiced" from the vowels on both sides (or a preceding⟨ŋ⟩in words like 방학 [paŋɦak] to become the voiced glottal fricative [ɦ].
If the ㅎ ceases to be pronounced at all, it is a case of elision.
