보낸다고

In a sentence

• 그는 나에게 편지를 보낸다고 했다.

  He said he would send me a letter.

  In this sentence, '보낸다고' indicates reported speech, communicating what someone said regarding sending a letter.

• 친구한테 메시지를 보낸다고 생각했는데 보내지 못했어요.

  I thought I was sending a message to a friend, but I couldn't send it.

  Here, '보낸다고' represents an action the speaker thought they were performing, which in this case is sending a message.

• 나는 다음 주에 이메일을 보낸다고 약속했어요.

  I promised to send an email next week.

  The usage of '보낸다고' in this sentence suggests a promise or intention to perform the action of sending an email.