See grammar notes.

Even after maximum effort has been made, the intended or anticipated goal or result has not come by.

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스티브는 도봉산에 갈 때 지하철에서 내려서 왜 택시를 탔을까요? 버스를 아무리 기다려도 버스가 안 와서 택시를 타고 갔습니다.

Role play

1. You wanted to confirm what you had heard about your friend. So you called your friend several times in the evening yesterday only in vain.
   Make up a dialogue that occurs when you run into this friend next morning.
   
   
2.  You are frustrated with your Korean. You have heard about an innovative way of improving your Korean your friend utilizes. Express your frustration to your friend and ask how you can improve your Koean.
   
   
3.  A has heard about B working on a diet.
   B complains that no result is apparent even when all the efforts have been made.
   [Key vocab: 살이 빠지다 'lose weight', 살이 찌다 'gain weight, get fat'
   다이어트하다 ' be on a diet'