1. Hangeul is a character that expresses sound. There can be 4 structures. ① 1 vowel ② consonant + vowel ③ vowel + consonant ④ consonant + vowel + consonant 2. Consonants and vowels are grouped in a square box (모아쓰기). 1) Vowels are written vertically on the right or horizontally on the bottom. [a] = ㅏ (write vertically on the right) [o] = ㅗ (write horizontally at the bottom) 2) Consonants repres..