before的用法和时态（的特殊用法-难得有这么详细的讲解）
before的用法和时态（的特殊用法-难得有这么详细的讲解）例句：b.过了多久才。。。， 动作进行到。。。程度才。。。。2)He ran off before I could stop him. 我还没来的及阻止，他已经跑了。3)To my great disappointment my favorite singer left the concert before I could have a word with her.让我非常失望的是，我还没有来得及和我喜欢的歌手打招呼，她就已经离开了。
每天坚持一点点，每天进步一点点。
a.没来的及。。。就。。。
例句：
1)The roof fell before he had time to dash into the room to save his baby. 他还没来的及冲进房间救孩子，房顶就塌了。
2)He ran off before I could stop him. 我还没来的及阻止，他已经跑了。
3)To my great disappointment my favorite singer left the concert before I could have a word with her.
让我非常失望的是，我还没有来得及和我喜欢的歌手打招呼，她就已经离开了。
b.过了多久才。。。， 动作进行到。。。程度才。。。。
例句：
1)They walked about fifty miles to the west before they saw a village. 他们西行50英里才看到一个村庄。
2)The workers worked day and night about three days before everything returned to normal. 工人们连续工作3天才使一切恢复正常。
3)He almost knocked me down before he knew it. 他几乎撞到我了才意识到。
4)We had walked a long way before we found some water. 我们走了很长的路才找到一点水。
5)Five years went by before I know it. 不知不觉，五年过去了。
c.It was 时间段 before… 过了多久才。。。
It was not long before … 不久，就。。。
It will (not) be 时间段 before… 要过多久。。。才。。。 (before 从句谓语动词要用一般时态)
例句：
1)It was not long before he sensed the danger of the position. 不久他就意识到他处境的危险。
2)It was five days before he came back. 5天后他才回来。
3)It will be half a year before you graduate from the school. 再过半年你才能毕业。
4)It will not be long before they understand each other. 他们大概不久就会互相了解。
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