얘기하는데

In a sentence

• 그 사람과 얘기하는데 어려움이 있었어요.

  I had difficulty talking with that person.

  Here, '얘기하는데' is used to indicate the act of talking with someone, expressing the context in which difficulties arose.

• 우리 얘기하는데 갑자기 전화가 왔어요.

  While we were talking, a phone call suddenly came.

  In this sentence, '얘기하는데' marks the ongoing conversation that was interrupted by an event.

• 지금 얘기하는데 나중에 다시 할게요.

  I am talking now, so I will talk again later.

  Here, '얘기하는데' indicates the current action of talking, emphasizing the timing for postponing another activity.