언제부터인지는

In a sentence

• 언제부터인지는 모르겠지만 그는 절대적으로 자주 운동을 합니다.

  I don't know since when, but he exercises very frequently.

  In this sentence, '언제부터인지는' is used to indicate an uncertainty or lack of knowledge about the starting point of an event or action, setting the context for the subsequent statement.

• 그녀는 언제부터인지는 말하지 않았지만, 그 소설을 읽는 것을 어제 끝냈다고 했습니다.

  She didn't say since when, but she said she finished reading the novel yesterday.

  Here, '언제부터인지는' is utilized to describe the lack of specific information provided regarding the beginning point of an action, emphasizing its relevance to the main action.

• 언제부터인지는 기억이 나지 않지만, 이 노래를 처음 들었을 때 정말 감동적이었습니다.

  I don't remember since when, but when I first heard this song, it was truly moving.

  In this example, '언제부터인지는' conveys the speaker's inability to recall the starting time of their knowledge or experience about an event, framing their narrative.