도와주세요ㅠ~

다음 밑줄 친 현재분사의 쓰임이 나머지와 다른 하나를 고르세요.

1) leaving home, he took an umbrella with him
2) when wo got to the second village, all the people there were marching in parade.
3) not knowing what to do, i just remained quiet.
4) i wrote a letter to my parents, posting it on the way to school.
5) the house, standing on the hill, commands a fine view.

음...사실은.. 해석이 안돼요....
해석이랑 같이 어떻게 쓰였는 지 알려주시면 감사하겠습니다^.^