高中英语知识点总结8篇 高级的”。2. before 的特殊用法(1) He had run out of the room before I could stop him.我还没来得及拦住他，他就跑出了屋子。(2) Three weeks went by before We knew it. 三周过去了，我们才意识到。(或：时间不知不觉已过三周了。)(3) It wasnt / didnt take long before he returned.他没过多久就回来了。It wont be long
