{
  "classes": [
    {
      "k": "ㅡ",
      "n": "ㅡ drops",
      "p": "A stem ending in ㅡ loses it. The 아/어 choice then follows the vowel BEFORE it.",
      "ex": [
        [
          "크다",
          "커"
        ],
        [
          "바쁘다",
          "바빠"
        ],
        [
          "슬프다",
          "슬퍼"
        ],
        [
          "쓰다",
          "써"
        ]
      ]
    },
    {
      "k": "ㅂ",
      "n": "ㅂ → 우",
      "p": "A ㅂ batchim turns into 우, which fuses with the ending: 워. Almost all are adjectives.",
      "ex": [
        [
          "덥다",
          "더워"
        ],
        [
          "어렵다",
          "어려워"
        ],
        [
          "무섭다",
          "무서워"
        ],
        [
          "쉽다",
          "쉬워"
        ]
      ]
    },
    {
      "k": "ㄷ",
      "n": "ㄷ → ㄹ",
      "p": "A ㄷ batchim becomes ㄹ before a vowel. 받다 and 닫다 are regular — they do not change.",
      "ex": [
        [
          "듣다",
          "들어"
        ],
        [
          "걷다",
          "걸어"
        ],
        [
          "묻다",
          "물어"
        ]
      ]
    },
    {
      "k": "르",
      "n": "르 doubles ㄹ",
      "p": "The 르 drops its ㅡ and an extra ㄹ lands on the previous syllable.",
      "ex": [
        [
          "모르다",
          "몰라"
        ],
        [
          "부르다",
          "불러"
        ],
        [
          "다르다",
          "달라"
        ],
        [
          "빠르다",
          "빨라"
        ]
      ]
    },
    {
      "k": "ㅅ",
      "n": "ㅅ drops",
      "p": "A ㅅ batchim disappears before a vowel, and no contraction follows. 웃다 and 씻다 are regular.",
      "ex": [
        [
          "낫다",
          "나아"
        ],
        [
          "짓다",
          "지어"
        ],
        [
          "붓다",
          "부어"
        ]
      ]
    },
    {
      "k": "ㅎ",
      "n": "ㅎ drops, vowel shifts",
      "p": "Colour adjectives and 그렇다-type words: the ㅎ goes and the vowel becomes ㅐ.",
      "ex": [
        [
          "그렇다",
          "그래"
        ],
        [
          "빨갛다",
          "빨개"
        ],
        [
          "어떻다",
          "어때"
        ]
      ]
    },
    {
      "k": "ㄹ",
      "n": "ㄹ drops before ㄴ ㅂ ㅅ",
      "p": "The 아/어 form is regular; the ㄹ only vanishes before certain endings.",
      "ex": [
        [
          "살다",
          "살아 · 사는"
        ],
        [
          "알다",
          "알아 · 아는"
        ],
        [
          "멀다",
          "멀어 · 먼"
        ]
      ]
    }
  ]
}