before you know where you are

例句：

1. 1.He arrived before the storm hit.
   他提前到达了，暴风雨来临之前。
2. 2. She decided to leave before the meeting began.
   她决定在会议开始前离开。
3. 3.The project was completed before the deadline.
   项目在截止日期之前完成了。