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This grammar pattern is used when an action is followed on the basis of the other action’s result.
● 꽂을 꺾어다가 꽃병에 꽂았어요. (I picked a flower and then put it into a vase.)
● 김밥을 사다가 반 친구하고 같이 먹었어요. (I bought some kimbap and then ate it with my classmate.)