since

I haven't visited my hometown since I moved to the capital city ten years ago.

(Chinese) 自从十年前搬到首都后，我再也没回过家乡。

Since the new policy was implemented, productivity has increased by fifteen percent.

(Chinese) 自从新政策实施以来，生产率提高了15%。

Since you are already here, you might as well stay for dinner with us.

(Chinese) 既然你已经在这儿了，不妨留下来和我们一起吃晚饭。

Since John is sick and cannot attend, we will have to postpone the meeting until Monday.

(Chinese) 既然约翰病了不能参加，我们只好把会议推迟到周一。