如何判断before的时态

　　表示“来不及； 尚未…..就…”

　　Before I could get in a word , he had measured me .

　　He ran off before I could stop him .

　　She left the company before I could have a word with her .

　　表示“刚…就…”

　　I had hardly sat down before the bell rang.

　　5. 表示“不知不觉就…..； 还没弄清就……”

　　Time passed quickly and three months went by before Aqiao knew it.

　　表示“宁愿…，决不…，与其…，毋宁….”常与will 或would 连用。

　　I would die before I would tell

　　I’d shoot myself before I apologized to him.

　　I would / will die before I surrender .

　　表示“否则；以免”

　　Do it now before you forget . I will write it down before I forget it .

　　用于句型“it was +时间段+ before …” 表示 “过了多久才…”

　　It was three days before he came back. .

　　用于句型 “ it was not long +时间段+ before …” 意为“不久就….”

　　It was not long before he sensed the danger of the position .

　　10. 用于句型“it will be(not )+时间段+ before….”表示“要过多久/ 不久…才…”

　　It will be half a year before you graduate from this school .

　　It will be not long before you find you are wrong .