에다가 [Intermediate Grammar]

 - 에다가

It is added to a place noun so that 'he/she is doing a certain action to the place', or 'another situation or an object is added to a certain situation or an object.' '에다' or '에' is enough to express the meaning.

Example: 

1.어디에다가 화분을 놓을까요? 
    Where should I put this flowerpot?

2. 열다섯에다 또 열다섯을 더하면 서른이지요.
     If you add 15 to 15, which comes to 30.

3. 고기에다가 생선에다가 여러 가지 음식을 차리셨더군요. 
    Not only meat but also fish! You've set various food dishes.

4. 커피에다가 설탕을 넣어 드릴까요?

    Would you like some sugar in your coffee?

5. 교실 벽에다가 시계와 달력을 걸었어요.

    I hung a clock and a calendar on the classroom wall.