out of(出于)

　　Looking out of the window， I saw a girl turn round the corner.

　　They came out of the room to welcome us.

　　My brother has been out of the hospital for a week.

　　(be out of the hospital 出院 be in hospital 住院)

　　He did it out of gratitude for us.

　　We helped the poor boy out of sympathy.

　　Please get out of the way. 别挡道。

　　All of us were out of breath when we got to the top of the mountain.

　　(be out of breath 气喘吁吁)

　　The coat is out of date. (be out of date 过时)

　　My mother is out of work now. (be out of work 失业)

　　since(自从)

　　They have been close friends since childhood.(从儿童时期他们就是好朋友)

　　We’ve always been on guard since then.(be on guard 警惕)

　　I got to know him last year， and have been writing to each

　　other since then.