- When the ending start with ㄴ, ㅂ or ㅅ then ㄹ from the verb is omitted.
- When the ending start with 으, 으 from the ending is omitted.
Irregular ㅂ
Rule
- When the verb is 돕다 or 곱다, ㅂ is replaced by 오.
- Otherwise, ㅂ is replaced by 우.
Irregular ㅎ
Rule
- On verb and when the ending start with a 으, both ㅎ and 으 are omitted.
- On verb and when the ending start with a 아 or 어, ㅎ is omitted and ㅣ is added.
- Otherwise, on verb and when the ending start with a vowel, ㅎ is omitted.
List of verb not affected by the ㅎ irregular rule, these are conjugated normally: 넣다,
낳다, 좋다, 많다, 찧다, 쌓다, 싫다 and 괜찮다.
Irregular ㅡ
Rule
ㅡ is always omitted when adding an ending that start with 아/어.
Irregular ㄷ
Rule
For a few verbs that end with ㄷ and the ending start with a vowel, ㄷ is replaced by ㄹ.
List of verb not affected by the ㄷ irregular rule, these are conjugated normally 걷다, 깨닫다, 묻다, 듣다 and 싣다.
Irregular ㅅ
Rule
For a few verbs that end with ㅅ and the ending start with a vowel, ㅅ is omitted.
List of verb not affected by the ㅅ irregular rule, these are conjugated normally 잇다, 낫다, 붓다, 긋다, 젓다 and 짓다.
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