‘르’ 불규칙

For most verb and adjective stems that end in 르, the ㅡ of 르 is omitted, and an additional ㄹ is added to form ㄹㄹ.

For most verbs that end with 르, 르 is replaced by ㄹㄹ. An example with the verb 다르다 and 아요 ending:

1. 다르다 + 아요
2. 다르다 + 아요
3. 다ㄹㄹ + 아요
4. 달ㄹ + 아요
5. 달라요