1. 밑줄 친 부분의 쓰임이 나머지 넷과 다른 것은?
①they are our soldiers, looking for this minstrel.
②she walked in the garden, singing softly.
③father is having breakfast, reading a newspaper.
④he had dinner, watching tv.

여기서 1번이라는데 2~4는 분사구문이라 그런것같고 1번의 쓰임이 무엇인가요??