The vowels are usually separated into two groups: monophthongs and diphthongs. Monophthongs are manufactured with a single articulatory movement (that's why the prefix mono), when diphthongs aspect an articulatory alter. Diphthongs have two constituents: a glide (or even a semivowel) and also a monophthong. You can find some disagreement about https://spencer1dba6.verybigblog.com/27692949/the-basic-principles-of-korean